Truffles: small, gnarly things. Equally ugly and alluring. Pungently intoxicating. Deliciously rare – and undeniably expensive. Alexandre Dumas described truffle as “the holy of holies”. Rossini called it “the Mozart of mushrooms”. Jean Anthelme Brillat-Savarin said just the name “awakens erotic and gastronomic ideas”. There’s something magical about the way these funghi lie just out of sight. The elusive treasures lurk beneath an otherwise unassuming forest floor, found only with the help of a specially trained hound. Once unearthed, however, they become the centrepiece to the world’s most expensive dishes, prized by Michelin-starred chefs and gourmands alike. They aren’t just another ingredient, however, there’s theatre to their presentation: the stage set in the kitchen, then served with a flourish tableside. For Rowan Jacobsen, author of the recently published Truffle Hound, one sniff was enough to keep him on the trail for three years. The Vermont-based writer was in Barolo in 2018 and on his way to the table, when he passed a giant white truffle under a glass cloche. Instinctively he lifted the dome: “I didn’t even make it to the table. Such a crazy smell. I was destroyed at the luncheon – I kept thinking about the truffle,” he tells me. That one flare of the nostrils had him hooked, and he’s been following truffle hunters around Europe ever since. His book follows his adventures – discovering “dreamers, schemers, and some extraordinary dogs” along the way. Piedmont is considered the home of the truffle – with the annual fair in Alba (running from October to December) the epicentre of the trade. White truffles (tuber magnatum), as found in Alba, are the crème de la crème of the truffle world – distinctly seasonal, flourishing in the autumn and winter. This brief window of opportunity is key to their appeal. As Donald Edwards, Head Sommelier at La Trompette, says, “What else can you have where the stopwatch of deliciousness is literally ticking by the table?” Of course, not all truffles are created equal. Black truffles are a third or a quarter of the price of white truffles and offer a very different aroma. Jacobsen describes “more pungent, more overwhelming” and “invigorating” scent of white truffle as “garlic, salami, almost gasoline” versus the “comforting, soothing, round” notes of “cured olives, cocoa and hazelnut” that he associates with black truffles. And while there is only one white truffle, there are two types of black truffle: the black winter truffle (or Périgord, tuber melanosporum, now mostly grown in Spain) and the black summer truffle (tuber aestivum, sometimes known as the Burgundy truffle but found all over northern Europe, including southern England). The latter, more widespread breed is not nearly as intense as its winter sibling, meaning more is needed for the same impact. One reason that white truffles carry such a premium is also that they have – so far – proven impervious to cultivation (although scientists in France have recently claimed to have cracked this). The truffle hunters, or trifulau, in Piedmont are therefore unsurprisingly secretive about where they find their treasure. Often speaking only a local dialect, these foragers roam the woods – often under the cover of darkness in search of “white gold”. Their dog will sniff their way to the right spot, pawing the ground and patiently waiting for their master to dig up their bounty. “It’s a billion-dollar industry totally dependent on dogs’ noses,” Jacobsen says, laughing at the absurdity. While the hunters might avoid the limelight, it’s not the case when it comes to their dogs, Jacobsen tells me. The canine connection is taken to the next level when you also depend on a four-legged friend for your livelihood. While pigs were the original snouts charged with sniffing out truffles, hunters switched to dogs in the 17th and 18th centuries. Lagotto Romagnolo is the “traditional” truffle-hunting breed (and comes with an associated premium, given their potential return), but today almost any dog is used. They simply need to be trained and have the right nose for the job. “Good ones are amazing,” Jacobsen tells me. “They can find a truffle 50 yards away in the forest and they just know it’s there.” Trifulau Luigi Rosso has been – along with his dog Danko (aged seven) – sniffing out the good stuff for 30 years. While it might look easy, he says that it’s incredibly difficult and can be dangerous for both hunters and their dogs, traipsing through forests in the dark. It is, however, all worth it for him. “The tranquillity that is in the air while you go for the truffles. The moon, the silence and only the sound of your footsteps on the damp leaves, then the joy of your dog when it finds one…” he tells me. The unique scent of truffle is what drives connoisseurs to seek them out – bidding on the finest examples for extortionate sums. “I feel like they've evolved to hit some deep pleasure receptors in our brains. When they're good you just want to luxuriate in them,” Edwards says. William Lowe MW – the man behind Cambridge Distillery – set about capturing the elusive flavours of truffle in his quest to create a digestif-style gin. The idea was born when looking at the digestif trolley in a Michelin-starred restaurant – and a sommelier who was scornful at the idea of a gin worthy of joining its ranks of fine Cognac and single malt whisky. “If you look at those rare and mature examples, you’ll see that the oxidative maturation process creates these beautiful earthy aromatic profiles sometimes referred to as ‘forest floor’. We wanted to achieve this profile through distillation rather than maturation, and truffles gave us the perfect route to do so,” Lowe says. “It took me a very, very long time. Because truffles are hard to deal with. They are packed full of volatiles, which is to say that truffles smell more than they taste,” the Master Distiller explains. “If you think it through – every time you open a door to a restaurant that is serving truffles, bang you get it straight away. But if you look at the food they serve truffles on and it’s always almost neutral dishes: creamy pasta, mushroom risotto. It’s never on super flavoursome dishes because if it is, you can’t taste the truffle anymore.” The challenge, however, was capturing something that doesn’t want to be caught, and finding the right level of truffle. “With truffle, chefs will normally do one of two things: either they’ll know you know it’s expensive so they’ll use loads of it so you can’t taste anything else for the rest of the meal – or they’ll do the opposite. They know that you know it’s expensive so they use so little that it’s the Emperor’s new clothes – you sort of have to search for it. It takes a genuinely skilled chef to use truffle well. And using it well is when you get all of that amazing aroma but you can still taste the other things.” This was what Lowe was aiming for – but it wasn’t easy. He spent months refining the distillation technique for truffle, but the flavour was only “ok”. He went back to the drawing board and decided that the problem was the truffle he was using – black wouldn’t cut it. “We went straight to Piemonte – white truffles from Alba. Gram for gram, worth more than gold […] and it came out and tasted a lot better than gold does so that’s an easy trade,” says Lowe. For trifulau Rosso, you need at least 10 grams on a dish (whereas, he says dismissively, restaurants will often only use a measly five) – with homemade tagliarini top of his list, although he also suggests trying it on panna cotta. He considers Pelaverga – a rare red variety that’s native to Piedmont – the classic pairing, but otherwise goes for one of the region’s other reds, Barbera, Barbaresco or Barolo. These are undoubtedly the classic pairings, following the simple rule of what grows together goes together. However, Jacobsen or Edwards don’t agree. “It couldn’t be more wrong. It really requires a white. The tannins clash with the aromatics,” Jacobsen says. The truffle specialist opts for Champagne, white Burgundy or cool-climate Californian Chardonnay – even Beaujolais. As for Edwards, he likes something that plays on the delicacy’s textural quality: “They work so well with buttery, umami-laden cheese sauces that I can't not want really classy Chardonnay. I want bâtonnage, I want really expensive but underplayed oak and I want ripeness with a gimlet-eyed stare of terroir behind. Basically, Burgundy, Mornington or the best of the Santa Rita Hills (I'll accept that other places also make perfect wines for this), plus if I can have a few years in bottle to build that sous bois flavour connection then all the better.” At the time of writing, we’re in the midst of the 2021 truffle season – one that has brought eye-watering prices. The hot, dry summer in Piedmont (unlike the wet conditions experienced in northern Europe) has led to a tiny crop – some say the smallest in history, driving prices up. Bloomberg has declared it “The Great White Truffle Crisis”. The white truffle needs such specific conditions that climate change, and – as Rosso tells me – the warmer autumns in Piedmont, pose a serious threat. While we consider Alba the spiritual home of white truffles, today most come from elsewhere. Both Central Italy and Le Marche, but also Romania, Serbia, Croatia and Hungary are all now hotspots for truffle hunting. Many of these regions are benefiting from the shift in climate, now having the ideal conditions to nurture the rare tuber magnatum. As for black truffles, the summer variety can now be found as far north as Sweden, but drought conditions mean that irrigation is becoming essential for existing orchards. Beyond climate, there are other challenges. In Piedmont, there are fewer forests than there once were, with more profitable vineyards replacing woodland (another reason that hunters are looking elsewhere). Also, the local trifulau are – in general – an ageing group. One truffle hunter, Carlo Marenda, has established a non-profit, Save the Truffle, to try and protect the region’s truffle hunting heritage – both by passing on the tradition to younger people and protecting the forests, nurturing the right environment for truffle growth. “It used to be that these forests were very actively used by farmers, peasants – fallen wood for firewood, leaves for animal bedding etc. So forests didn’t have a lot of undergrowth,” Jacobsen explains. “But then the world changed.” With the forest floor not being cleared, decaying matter acidified the soil – something that truffles hate. Truffles thrive in high pH soils, which is why they’re found on beds of limestone. To ensure the forests provide a welcoming home for the tubers, it’s essential they’re managed correctly. While there are certainly challenges to preserving the truffle’s place in Piedmont, the good news for gastronomes is that these tubers aren’t disappearing – just moving. After three years on the trail, Jacobsen is as enchanted by truffles as when he began. But he’s less keen on the hierarchy that comes with them. There are, he says, plenty more species of truffle beyond those currently on the market – but hunters can’t sell them, so keep them for themselves. He hopes the truffle culture will shift to grassroots foraging, rather than “waiters in tuxedos grating your precious morsel over your pasta”. However it reaches your table, it’s clear that the truffle holds a special allure – and the transience of its elusive scent, fading with the seasons, is what keeps us on the hunt. Truffle Hound is out now. Explore more Editorial 

Love them or loathe them, truffles are undoubtedly some of the most majestic ingredients on the planet. But, with a changing climate and an ageing cohort of specialist truffle hunters, the future of this rare delicacy is uncertain. Sophie Thorpe explores

Truffles are undoubtedly some of the most majestic ingredients on the planet. But the future of this rare delicacy is uncertain. Sophie Thorpe explores

Chasing truffles

With “freshness” and “structure” often the buzz words defining the best Bordeaux wines of recent warm vintages – the plush richness and suppleness brought by the Merlot variety often seems undersold compared to the role of the Cabernets in the blend.  Christian Moueix, Director at Petrus (1970-2008), Trotanoy and La Fleur-Petrus; John Kolasa of Chateau Rauzan Segla and Chateau Canon (1997-2015); Maylis Marcenat of Chateau Clos de Sarpe; as well as Pascal Baratie of Chateau Haut-Brion - the First Growth with the highest proportion of merlot in its blend - identify how global warming is affecting merlot and what this means for its long term future in the region.  We also discover why merlot became central to Bordeaux’s success and today remains much loved, providing it is grown in the right place and managed correctly. 
Managing rising alcohol levels There is no grape more synonymous with the region of Bordeaux than merlot, playing an extensive role in almost all wines of the region on both the Left and Right Banks. Whilst it plays second fiddle to the cabernet sauvignon dominant wines of Saint-Julien and Pauillac, everywhere else from Pessac to Pomerol it plays a significant role in the blend. But merlot in
recent years has become a concern for many in the region. With the rising climatic temperatures in Bordeaux, some vignerons are struggling to manage ever-rising alcohol levels, whilst trying to achieve full phenolic ripeness of the tannins in the skins and seeds.  Merlot is an earlier ripening variety than cabernet sauvignon and its sugar levels can increase quickly in hot temperatures, leaving an imbalance between sugar and tannin ripeness. The more steady the temperatures are through the summer, the more chance the sugar levels and phenolic ripeness will reach optimum levels at the same time. In a hot vintage, sugar levels rise too quickly forcing vignerons to pick the grapes before they have had time for the tannins to reach phenolic maturity, afraid that if the sugar levels become too high, there will be a drop in acidity, as well as causing serious problems at fermentation. For Pascal Baratie, vineyard manager at Chateau Haut-Brion the higher levels of alcohol have not however proved problematic for them, stating “since the 2000s, there has been a gap between phenolic maturity and technological maturity (measurement of sugar and acidity levels). Today, during the maturity checks in the vineyard before the harvest, when we taste the grapes at 13 degrees potential alcohol, we note that the tannins are still hard… so we need to wait to obtain more supple tannins and greater phenolic maturity.  The balance obtained today, is certainly different to pre-2000 levels, but we are fortunate to be on a great terroir, which produces balanced wines, with a good tannic potential even with high alcoholic degrees. The regularity of great vintages of the last 20 years lets us think that the supposed problem of alcoholic degrees is more in the head than in the glass.” However not all Chateaux are fortunate to share the same terroir as Haut-Brion. Drought in Bordeaux 
Higher alcohols are not the only concern with merlot. Drought is also becoming problematic when trying to plant young merlot vines in Bordeaux, particularly on gravel soils. Merlot requires moisture to grow and whilst the clay-rich soils of Saint-Estephe on the Left Bank and Pomerol and Saint-Emilion on the Right Bank naturally retain moisture; the gravel soils in Margaux, Saint Julien and Pauillac are becoming increasingly dry in the warming climate. John Kolasa states “this is becoming a real problem where there is deep gravel, like in Margaux.  Young merlot vines need years of root growth to break through the gravel and reach water reserves below, but in parts of Margaux where the gravel can be up to two metres deep, the roots take longer than three years to break through. Three years is the current allowance for
irrigating vines in the region. It is once this irrigation stops that these vines suffer and die. It is one of the reasons you see less merlot being planted in Margaux. If they can’t find a way for young merlot vines to survive in gravel soils, it will undoubtedly lead to a change in style over the coming years.”  Merlot's susceptibility to disease Global warming effects are not just an increase in temperatures but an increase in erratic weather episodes, leading to a heightened pressure of rot and mildew – something merlot is much more susceptible to than the cabernet varieties, due to its thinner skin.  “Merlot is a wonderful variety but it is more difficult to manage these days” states Maylis Marcenat from Saint-Emilion's Chateau Clos de Sarpe. “In 2018, our merlot suffered a lot from mildew. We lost around 40% of our production mostly on the merlot vines. The cabernet franc has a better resistance.  The weather is more uncertain these days, a lot of rain followed by a very dry season makes it difficult to predict.”  Rot is also a concern and certainly nothing new in the region, it plagued the merlot vines of the late sixties and seventies. So much so, that replanting of the variety was in fact banned in Pomerol following the disastrous 1968 vintage. Vignerons were instead strongly encouraged to plant cabernet sauvignon. Christian Moueix recalls, “I remember, of course, the terrible rot of 1968 and the desire of some researchers to find a varietal resistant to rot. I attended many meetings in 1970-1971 and protested against the banning of planting Merlot. It was a violent controversy and, in 1972, I refused to plant those new cabernets sauvignons in Pomerol.”  Moueix’s decision was justified. John Kolasa states following this ”it became very fashionable to grow cabernet sauvignon in the '60s and '70s on the wrong rootstocks!” Kolasa ended up pulling out all the cabernet sauvignon vines planted at Chateau Canon during this time, stating, “the damn things would never ripen”. The early '70s saw a bout of poor vintages for the region largely due to bad weather either just before or during harvest. The cabernet sauvignon at the time was unripe, incredibly green and it was the earlier ripening merlot that became the more reliable source. 

Kolasa outlines one theory behind the rot that plagued Merlot on the Right Bank at that time. “Much of the Right Bank back then was undeveloped, compared to the bigger estates on the Left Bank. The vineyards were also producing many other fruit and vegetables. When the vineyards were ploughed by horse and cart these fruit trees were not a problem, the horse
simply went around the tree, but with the introduction of tractors and machinery, many vignerons simply chopped down the tree.  The trouble is they killed the tree but left the roots in the ground. Similarly to roses, if you leave dead roots in the ground they become infected with fungi. These dead roots in the soil came to plague vineyards with rot at that time.” John recalls finding rotting roots all over the vineyards at Chateau Canon. His first year at the property in 1997, he made two separate cuvees, one from vines away from the tree roots and one nearby.  “I only had to put my nose in the glass of the two to know which one was which, the wine made by the affected vines smelt terrible. Following that experiment it was so clear to me. I took up all the vines affected. Pulling up old vines is never something one wants to do, knowing that it will takes decades for the new vines to reach maturity, but these vines were so infected I was left with no choice.”  Merlot as a more reliable source of ripe fruit found favour through the '70s and '80s. By the mid '90s, the influence of the American market enamoured by the plush, richness and soft texture the merlot provides in the blend, only saw more plantings of the variety.  For Christian Moueix the Americans love affair with Merlot stopped in 2005, with the release of the film Sideways which saw the main character famously state, "If anyone orders Merlot, I'm leaving, I am NOT drinking any f**king merlot!”. It is worth noting his favourite wine in the film was Cheval Blanc, a merlot blend! The damaging effects of global warming have only further put merlot in the shadows as the cabernet varieties share the limelight, but these vignerons are confident of its future in Bordeaux. 
Merlot still remains essential to the Bordeaux psyche Christian Moueix states: “Global warming has been positive for Bordeaux as everybody would admit. The rising of alcohol is almost impossible to control since it comes not only from heat and sun but from the level of CO2 in the atmosphere”. For Moueix provided merlot is planted in the right soil he is confident in its prolonged future in the region.  “We still replant merlot in Pomerol and Saint-Emilion; this is the varietal best suited to our terroirs. To manage the climate, we have adapted the canopy to avoid the direct impact of sun. This is all we can do at this point unless the addition of water becomes legal.” Baratie from Chateau Haut Brion outlines the importance of balance that both the merlot and cabernet varietals still bring to the classic Bordeaux blend. “We do not want to part with Merlot because it is satisfactory today even in hot years and for the future we want to keep its current proportion. We have to keep a balanced planting to obtain maturity on plots of
merlot and cabernets whatever the weather conditions of the year. From time to time, we have cooler years and it is interesting to have matured Merlot, when the cabernet sauvignons are likely to be harder and herbaceous. In 2011, a very dry spring year, Chateau Haut-Brion was made up of only 35% merlot, while in 2012, a more classic climate year, it was made up of 65.5% merlot. Over two successive years, the climatic conditions were different and led us to select a different proportion of grape varieties in the wine. We can see that we cannot do without merlot in one vintage like the other. Merlot brings an interesting juice, as well as sweetness, fine and supple tannins which make it essential. It may be replaceable with another grape, but at the moment we do not have the knowledge.”  The importance of terroir Despite the risks of rot, drought, mildew and high sugar levels, fantastic merlot continues to be grown in Bordeaux providing the terroir is right. Speaking with these vignerons one thing they all agree on is that the soil remains the most fundamental aspect to its success - in the past, today and in the future. “Merlot grown on clay and limestone soil can still preserve freshness as well as minimal hydric stress in my terroir.  So why not use it?" states Maylis Marcenat from Chateau Clos de Sarpe. “The merlot is still an exceptional plant. The sweetness, the complexity is unique. I think in Saint Emilion, and especially on clay and limestone, all the merlot are more creamy, tasty, with a lot of juiciness.“ At Chateau Haut-Brion, Baratie agrees, “We tend to favour merlot on grounds that are relatively well supplied with water and to favour cabernet sauvignon on gravelly soils. But we have plots of merlot on gravelly soils, little supplied with water, which give very great wines every year and we do not plan to change the grape variety on these very qualitative plots. But
in addition, we are adapting later ripening and drought-resistant rootstocks.” Intra-plot vinification, precise technical understanding of viticulture, clonal development, replanting better-matched rootstocks, has all helped Bordeaux and Merlot in particular, cope with the changing climate. But the art of blending is still vital part of the wines of Bordeaux and today has become an important measure to reduce the alcohol in Merlot-dominant wines. Cabernet Franc to the rescue Many wineries up and down the Medoc are lowering the proportion of merlot in their blends, opting more for cabernet franc. John Kolasa outlines how cabernet franc can effectively lower the overall alcohol level in the blend of a wine. “Blending just 5% of cabernet franc in with merlot can be an effective method of lowering the alcohol, as well as adding freshness. It is something Petrus did with the 2019 vintage. Look at the success of Chateau Figeac in 2019 – a third cabernet franc, a third merlot and a third cabernet Sauvignon. This is a big increase of cabernet franc in the blend and is performing better in the warming climate”. 
The future of Merlot Despite the difficulties Merlot is facing, there seems plenty of ways vignerons in the region are adapting to manage Merlot differently in this warmer climate. Marcenat of Clos du Sarpe believes “the way of cultivating must change. Less green harvesting, we no longer need too much concentration in the grapes, we must be careful with the thinning of the canopy. Merlot needs more cover crops, it benefits from keeping as much grass as possible and we must choose the right organic fertiliser. With this in place, merlot has a future”. For Baratie “The balance of the wines obtained in recent years suits us, thanks to the contribution of merlot, cabernet franc and cabernet sauvignon, so we are not worried about the future of merlot. However, thanks to our clonal selection initiated by Jean-Bernard Delmas, today we choose clones on a different criteria from those desired in the past. We currently favour two criteria: the Total Polyphenol Index (IPT) and yields that are not too low.” No doubt helping to modify concentration of alcohol and adding structural freshness
from the higher levels of tannins. Moueix too sees Merlot having a long future ahead in Bordeaux but at the same time would welcome new clones of Merlot that produce less alcohol. “Nevertheless,” states Christian, ”I dare to compare it to a vaccine: it would need a lot of experiments before taking the risk of replacing the present clones which produce wonderful wines.” Perhaps the biggest threat for the future of merlot therefore comes not from the clay-rich soils of the Right Bank but from the gravel-rich soils of the Medoc, where it remains a minority in the blend, but nevertheless an important element to the profile of these wines. If a solution cannot be found for growing young merlot vines on gravel soil, will we see alternatives varieties in the assemblage and a change in style? Browse all Bordeaux listings or explore more Editorial 

Merlot today remains the most-planted variety in Bordeaux but its dominance is waning somewhat in an ever warming climate. 

Merlot remains the most-planted grape variety in Bordeaux. We explore why it became central to Bordeaux’s success and remains so highly regarded

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