Truffle

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For other uses, see Truffle (disambiguation).
Black Périgord Truffle
Crispy veal sweetbreads filled with truffle

A truffle is the fruiting body of a subterranean Ascomycete fungus, predominantly one of the many species of the genus Tuber. Some of the truffle species are highly prized as a food. French gourmand Jean Anthelme Brillat-Savarin called truffles "the diamond of the kitchen".[1] Edible truffles are held in high esteem in French, Georgian, Greek, Italian, Middle Eastern and Spanish cooking, as well as in international haute cuisine. Truffles are ectomycorrhizal fungi and are therefore usually found in close association with the roots of trees. Spore dispersal is accomplished through fungivores, animals that eat fungi.

Etymology[edit]

The origin of the word truffle appears to be the Latin term tuber, meaning "swelling" or "lump", which became tufer- and gave rise to the various European terms: French truffe, Spanish trufa, Danish trøffel, German Trüffel, Swedish tryffel, Dutch truffel, Polish trufel, Serbian тартуф / tartuf and Croatian tartuf. In Portuguese, the words trufa and túbera are synonyms, the latter closer to the Latin term. The German word Kartoffel ("potato") is derived from the Italian tartufo (truffle) because of superficial similarities.[2]

Biology[edit]

The mycelia of truffles form symbiotic, mycorrhizal relationships with the roots of several tree species including beech, poplar, oak, birch, hornbeam, hazel, and pine.[3][4] They prefer argillaceous or calcareous soils that are well drained and neutral or alkaline.[5][6] Truffles fruit throughout the year, depending on the species and can be found buried between the leaf litter and the soil.

Phylogeny[edit]

The phylogeny and biogeography of truffles was investigated in 2008[7] using internal transcribed spacers (ITS) of nuclear DNA with five major clades (Aestivum, Excavatum, Rufum, Melanosporum and Puberulum); this was later improved and expanded in 2010 using large-subunits (LSU) of mitochondrial DNA to nine major clades. The Magnatum and Macrosporum clades were distinguished as distinct from the Aestivum clade. The Gibbosum clade was resolved as distinct from all other clades, and the Spinoreticulatum clade was separated from the Rufum clade.[8]

Types[edit]

White truffle[edit]

White truffle washed and cut

The "white truffle" or "trifola d'Alba" (Tuber magnatum) comes from the Langhe and Montferrat areas[9] of the Piedmont region in northern Italy and, most famously, in the countryside around the cities of Alba and Asti;[10] in Italy it can also be found in Molise, Abruzzo, and in the hills around San Miniato, in Tuscany. It is also found on the Istria peninsula, in Croatia in the Motovun forest along the Mirna river,[11] and in Slovenia along the Dragonja and Rizana river,[12] as well as in the Drome area in France. Growing symbiotically with oak, hazel, poplar and beech and fruiting in autumn, they can reach 12 cm (5 in) diameter and 500 g, though are usually much smaller. The flesh is pale cream or brown with white marbling.[13] Italian white truffles are very highly esteemed (illustration, left) and are the most valuable on the market: The white truffle market in Alba is busiest in the months of October and November when the Fiera del Tartufo (truffle fair) takes place. In 2001, the Tuber magnatum truffles sold for between $1000–$2200 per pound ($2000–$4500 per kg);[14] as of December 2009 they were being sold at $14,203.50 per kilogram.

In 1999, Giancarlo Zigante and his dog Diana found one of the largest truffles in the world near Buje, Croatia. The truffle weighed 1.31 kilograms (2 lb 14 oz) and has entered the Guinness Book of Records.[15]

The record price paid for a single white truffle was set in December 2007, when Macau casino owner Stanley Ho paid $330,000 (£165,000) for a specimen weighing 1.5 kilograms (3.3 lb), discovered by Luciano Savini and his dog Rocco. One of the largest truffles found in decades, it was unearthed near Pisa, Italy and sold at an auction held simultaneously in Macau, Hong Kong and Florence.[16] This record was then matched on November 27, 2010 when Ho again paid $330,000 for a pair of white truffles, including one weighing nearly a kilogram.

The Tuber magnatum pico white truffle is found mostly in northern and central Italy, while the Tuber borchii, or whitish truffle, is found in Tuscany, Abruzzo, Romagna, Umbria, the Marche and Molise. Neither of these is as aromatic as those from Piedmont, although those from Città di Castello come quite close.[13]

Black truffle[edit]

Main article: Black truffle
Black Périgord Truffle, cut

The black truffle or black Périgord truffle (Tuber melanosporum), the second-most commercially valuable species, is named after the Périgord region in France and grows with oak and hazelnut trees. Black truffles are harvested in late autumn and winter.[13] The genome sequence of the black truffle was published in March 2010.[17]

Summer or burgundy truffle[edit]

Main article: Summer truffle
Black summer truffle (in Italian: Tartufi Neri Estivi) in a shop window in Rome, Italy
Desert truffle - Terfezia spp. from Avanos, Turkey

The black summer truffle (Tuber aestivum) is found across Europe and is prized for its culinary value. Burgundy truffles (Tuber uncinatum) are harvested in autumn until December and have aromatic flesh of a darker colour.

Other species[edit]

A less common truffle is "garlic truffle" (Tuber macrosporum). In the U.S. Pacific Northwest, several species of truffle are harvested both recreationally and commercially, most notably, the "Oregon white truffles", Tuber oregonense and Tuber gibbosum.

The "pecan truffle" (Tuber lyonii)[18] syn. texense[19] is found in the Southern United States, usually associated with pecan trees. Chefs who have experimented with them agree "they are very good and have potential as a food commodity".[20] Although pecan farmers used to find them along with pecans and discard them, considering them a nuisance, they sell for about $100 a pound and have been used in some gourmet restaurants.

Truffle-like species[edit]

The term "truffle" has been applied to several other genera of similar underground fungi. The genera Terfezia and Tirmania of the family Terfeziaceae are known as the "desert truffles" of Africa and the Middle East. "Hart's truffle" is a name for Elaphomycetaceae. Pisolithus tinctorius, which was historically eaten in parts of Germany, is sometimes called "Bohemian truffle".[21]

History[edit]

Antiquity[edit]

The first mention of truffles appears in the inscriptions of the neo-Sumerians regarding their Amorite enemy's eating habits (Third Dynasty of Ur, 20th century BC)[22] and later in writings of Theophrastus in the fourth century BC. In classical times, their origins were a mystery that challenged many; Plutarch and others thought them to be the result of lightning, warmth and water in the soil, while Juvenal thought thunder and rain to be instrumental in their origin. Cicero deemed them children of the earth, while Dioscorides thought they were tuberous roots.[21]

Italy in the Classical period produced three kinds of truffles: the Tuber melanosporum, the Tuber magnificanus and the Tuber magnatum. The Romans, however, only used the terfez (Terfezia bouderi), a fungus of similar appearance, which the Romans called truffles, and which is sometimes called "desert truffle". Terfez used in Rome came from Lesbos, Carthage, and especially Libya, where the coastal climate was less dry in ancient times.[21] Their substance is pale, tinged with rose. Unlike truffles, terfez have no taste of their own. The Romans used the terfez as a carrier of flavour, because the terfez have the property to absorb surrounding flavours. Indeed, Ancient Roman cuisine used many spices and flavours, and terfez were perfect in that context.

Middle Ages[edit]

Truffles were rarely used during the Middle Ages. Truffle hunting is mentioned by Bartolomeo Platina, the papal historian, in 1481, when he recorded that the sows of Notza were without equal in hunting truffles, but they should be muzzled to prevent them from eating the prize.[23]

According to a hadith narrated by Saeed bin Zaid, Muhammad said that truffles are like manna and that water from truffles "heals eye diseases".[24]

Renaissance and modern times[edit]

During the Renaissance, truffles regained popularity in Europe and were honoured at the court of King Francis I of France. However, it was not until the 17th century that Western (and in particular French) cuisine abandoned "heavy" oriental spices, and rediscovered the natural flavour of foodstuffs. Truffles were very popular in Parisian markets in the 1780s. They were imported seasonally from truffle grounds, where peasants had long enjoyed their secret. Brillat-Savarin (1825) noted characteristically that they were so expensive they appeared only at the dinner tables of great nobles and kept women. A great delicacy was a truffled turkey.

Cultivation[edit]

Truffles long eluded techniques of domestication, as Jean-Anthelme Brillat-Savarin (1825) noted:

Mushroom and truffle output in 2005
Planted truffle groves near Beaumont-du-Ventoux

"The most learned men have sought to ascertain the secret, and fancied they discovered the seed. Their promises, however, were vain, and no planting was ever followed by a harvest. This perhaps is all right, for as one of the great values of truffles is their dearness, perhaps they would be less highly esteemed if they were cheaper." [1]

However, truffles can be cultivated.[25] As early as 1808, there were successful attempts to cultivate truffles, known in French as trufficulture. People had long observed that truffles were growing among the roots of certain trees, and in 1808, Joseph Talon, from Apt (département of Vaucluse) in southern France, had the idea of transplanting some seedlings that he'd collected at the foot of oak trees known to host truffles in their root system.

The experiment was successful: Years later, truffles were found in the soil around the newly grown oak trees. In 1847, Auguste Rousseau of Carpentras (in Vaucluse) planted 7 hectares (17 acres) of oak trees (again from acorns found on the soil around truffle-producing oak trees), and he subsequently obtained large harvests of truffles. He received a prize at the 1855 World's Fair in Paris.[26]

These successful attempts were met with enthusiasm in southern France, which possessed the sweet limestone soils and dry, hot weather that truffles need to grow. In the late 19th century, an epidemic of phylloxera destroyed many of the vineyards in southern France. Another epidemic destroyed most of the silkworms there, too, making the fields of mulberry trees useless. Thus, large tracts of land were set free for the cultivation of truffles. Thousands of truffle-producing trees were planted, and production reached peaks of hundreds of tonnes at the end of the 19th century. In 1890, there were 75,000 hectares (190,000 acres) of truffle-producing trees.

Truffle market in Carpentras

In the 20th century, however, with the growing industrialization of France and the subsequent rural exodus, many of these truffle fields (champs truffiers or truffières) returned to wilderness. The First World War also dealt a serious blow to the French countryside, killing 20% or more of the male working force. As a consequence, newly acquired techniques of trufficulture were lost. Also, between the two world wars, the truffle groves planted in the 19th century stopped being productive. (The average life cycle of a truffle-producing tree is 30 years.) Consequently, after 1945, the production of truffles plummeted, and the prices have risen dramatically. In 1900, truffles were used by most people, and on many occasions. Today, they are a rare delicacy reserved for the rich, or used on very special occasions.

In the last 30 years, new attempts for mass production of truffles have been started. Eighty percent of the truffles now produced in France come from specially planted truffle groves. Nonetheless, production has yet to recover its 1900s peaks. Local farmers are opposed to a return of mass production, which would decrease the price of truffles. There are now truffle-growing areas in the United Kingdom, United States, Spain, Sweden, New Zealand, Australia and Chile.

In New Zealand and Australia[edit]

The first black truffles (Tuber melanosporum) to be produced in the Southern Hemisphere were harvested in Gisborne, New Zealand in 1993.[27]

In 1999, the first Australian truffles were harvested in Tasmania,[28] the result of eight years of work. Trees were inoculated with the truffle fungus in the hope of creating a local truffle industry. Their success and the value of the resulting truffles has encouraged a small industry to develop. A Western Australian venture, The Wine and Truffle Company, had its first harvest in 2004, and in 2005 they unearthed a 1-kg (2.2-lb) truffle. In 2008, an estimated 600 kilograms (1,300 lb) of truffles were removed from the rich ground of Manjimup. Each year, The Wine and Truffle Company has expanded its production, moving into the colder regions of Victoria and New South Wales.

In June 2010, Tasmanian growers Michael and Gwynneth Williams harvested Australia's largest truffle from their property at Myrtle Bank, near Launceston. It weighed in at 1.084 kilograms (2 lb 6.2 oz).[29] Mrs. Williams told ABC Radio in Australia[30] that it is valued at about A$1,500 per kg.

New Zealand's first burgundy truffle was found in July 2012, at a Waipara truffle farm. It weighed 330 g, and was found by Rosie, the farm owner's beagle.[31]

Extraction[edit]

Trained pig in Gignac, Lot, France
Trained dog in Mons, Var

Looking for truffles in open ground is almost always carried out with specially trained pigs (truffle hogs) or, more recently, dogs. The Lagotto Romagnolo is currently the only dog breed recognized for sniffing out truffles (although virtually any breed could be trained for this purpose).[32]

Truffle hog Truffle dog
Keen sense of smell Keen sense of smell
Innate ability to sniff out truffles Must be trained
Tendency to eat truffles once found Easier to control

The female pig's natural truffle-seeking, as well as her usual intent to eat the truffle, is due to a compound within the truffle similar to androstenol, the sex pheromone of boar saliva, to which the sow is keenly attracted.

In Italy, the use of the pig to hunt truffles is prohibited since 1985 due to damage caused by animals to truffle's mycelia during the digging that dropped the production rate of the area for some years.

Culinary use[edit]

Truffle oil (olive oil with Tuber melanosporum).

Because of their high price[33] and their pungent taste, truffles are used sparingly. Supplies can be found commercially as unadulterated fresh produce or preserved, typically in a light brine.

White truffles are generally served raw, and shaved over steaming buttered pasta or salads or fried eggs. White or black paper-thin truffle slices may be inserted into meats, under the skins of roasted fowl, in foie gras preparations, in pâtés, or in stuffings. Some speciality cheeses contain truffles, as well.

The flavor of black truffles is far less pungent and more refined than that of white truffles. Its strong flavor is often described as syrupy sweet. Black truffles also are used for producing truffle salt and truffle honey.

While in the past chefs used to peel truffles, in modern times, most restaurants brush the truffle carefully and shave it or dice it with the skin on so as to make the most of this valuable ingredient. A few restaurants, such as Philippe Rochat in Switzerland, still stamp out circular discs of truffle flesh and use the skins for sauces.

Truffle oil[edit]

Main article: Truffle oil

Truffle oil is often used as a lower-cost and convenient substitute for truffles, to provide flavoring, or to enhance the flavor and aroma of truffles in cooking. Most "truffle oil", however, does not contain any truffles.[34] The vast majority is olive oil which has been artificially flavoured using a synthetic agent such as 2,4-dithiapentane.[34] Daniel Patterson reported in the New York Times that "even now, you will find chefs who are surprised to hear that truffle oil does not actually come from real truffles."

Truffle vodka[edit]

Main article: Truffle vodka

The bulk of truffle oil on the market is made with a synthetic ingredient, as are many other truffle products. However, alcohol is now being used to carry the truffle flavour without the need for synthetic flavourings. The first truffle vodka, Black Moth Vodka, is a natural vodka infused with black Périgord truffles (Tuber melanosporum). Although primarily used as a spirit in its own right and mixed in a range of cocktails, truffle vodka is also used by various chefs to flavour dishes by evaporating the alcohol through cooking whilst retaining the truffle aroma.[35]

References[edit]

  1. ^ a b Brillat-Savarin, Jean Anthelme (1838) [1825]. Physiologie du goût. Paris: Charpentier.  English translation
  2. ^ Simpson J, Weiner E.(eds) (1989) Oxford English Dictionary, 2nd edition, Clarendon Press, ISBN 0-19-861186-2
  3. ^ "‘finds’ registered at Royal Botannical Gardens, Kew". Truffle UK Ltd. Retrieved 2008-05-17. 
  4. ^ "Non-cultivated Edible Fleshy Fungi". Retrieved 2008-05-17. "...it has been known for more than a century that truffles were mycorrhizal on various trees such as oak, beech, birch, hazels, and a few others" 
  5. ^ Karen Hansen (Spring 2006). K. Griffith, ed. "Basidiomycota truffles: Cup fungi go underground" (PDF). Newsletter of the FRIENDS of the FARLOW. Harvard University. Retrieved 2008-05-17. "Generally, truffles seems to prefer. warm, fairly dry climates and calcareous soils" 
  6. ^ "Mushroom Production". Mycology - Uses of Fungi. University of Sydney. June 2004. Archived from the original on 2008-05-01. Retrieved 2008-05-17. "The soil of the truffiere tends to be alkaline, calcareous, and well drained." 
  7. ^ Jeandroz, S., Murat, C., Wang, Y., Bonfante, P., Le Tacon, F. (2008). Molecular phylogeny and historical biogeography of the genus Tuber, the true truffles. Journal of Biogeography, 35 (5), 815-829. DOI : 10.1111/j.1365-2699.2007.01851.x
  8. ^ Bonito GM, Gryganskyi AP, Trappe JM, Vilgalys R (2010). "A global meta-analysis of Tuber ITS rDNA sequences: species diversity, host associations and long-distance dispersal.". Molecular Ecology 19: 4994–5008. 
  9. ^ "White truffles from Alba". Lifeinitaly.com. Retrieved 2012-06-16. 
  10. ^ "Wine and Truffles Adventure - Piemonte". Savoryadventures.com. Retrieved 2012-06-16. 
  11. ^ Čeština. "Gastro.croatia.hr". Gastro.croatia.hr. Retrieved 2012-06-16. 
  12. ^ "istrias gold truffles of the slovenian istria are the best in the world". Retrieved 2013-10-16. 
  13. ^ a b c Carluccio A (2003). The Complete Mushroom Book. Quadrille. ISBN 1-84400-040-0. 
  14. ^ "Education & Networking | National Restaurant Association | National Restaurant Association". Restaurant.org. Retrieved 2012-06-16. 
  15. ^ "Largest truffle". Guinnessworldrecords.com. 1999-11-02. Retrieved 2012-06-16. 
  16. ^ "Giant truffle sets record price". BBC News. 2007-12-02. Retrieved 2007-12-02. 
  17. ^ Martin, Francis; Kohler, Annegret; Murat, Claude; et al. (2010), Périgord black truffle genome uncovers evolutionary origins and mechanisms of symbiosis, Nature 464 (7291), doi:10.1038/nature08867, PMID 20348908 
  18. ^ Fred K. Butters. "A Minnesota Species of Tuber". Botanical Gazette 35 (6): 427–431. doi:10.1086/328364. JSTOR 2556357. 
  19. ^ J.M. Trappe, A.M. Jumpponen and E. Cázares (1996). "NATS truffle and truffle-like fungi 5: Tuber lyonii (=T. texense), with a key to the spiny-spored Tuber species groups". Mycotaxon 60: 365–372. 
  20. ^ Tim Brenneman. "Pecan Truffles". Retrieved 2010-06-03. 
  21. ^ a b c Ramsbottom J (1953). Mushrooms & Toadstools. Collins. ISBN. 
  22. ^ Chiera, E. (1934), "Nos. 58 and 112", Sumerian Epics and Myths, Chicago 
  23. ^ Benjamin, D. R. (1995), "Historical uses of truffles", Mushrooms: Poisons and Panaceas — A Handbook for Naturalists, Mycologists and Physicians, New York: WH Freeman and Company, pp. 48–50, ISBN 0716726009 
  24. ^ Sahih al-Bukhari, volume 7, number 609.
  25. ^ Ian R. Hall and Alessandra Zambonelli, "Chapter 1: Laying the Foundations" in: Alessandra Zambonelli and Gregory M Bonito, ed.s, Edible Ectomycorrhizal Mushrooms: Current Knowledge and Future Prospects (Berlin & Heidelberg, Germany: Springer Verlag, 2012), § 1.2 Cultivation of Truffles: pp. 4-6.
  26. ^ Rousseau, "Truffes obtenues par la culture de chênes verts" (Truffles obtained by the cultivation of green oaks) in: Exposition universelle de 1855 : Rapports du jury mixte international, volume 1 (Paris, France: Imprimerie Impériale, 1856), pp. 173-174.
  27. ^ "Truffles in New Zealand". Southern_truffles.co.nz. Retrieved 2012-07-19. 
  28. ^ Zambonelli, Alessandra; Bonito, Gregory M, eds. (2013). Edible Ectomycorrhizal Mushrooms: Current Knowledge and Future Prospects. Germany: Springer. p. 193. ISBN 978-3-64233822-9. Retrieved 22 Mar 2014. 
  29. ^ "Northeast growers break record with 1084g truffle find". The Examiner. 27 June 2010. 
  30. ^ Australia's ABC Radio, Local Radio network, "Australia All Over" program, 27 June 2010
  31. ^ "Beagle digs up a New Zealand first". stuff.co.nz. Retrieved 2012-07-26. 
  32. ^ Krista Simmons (28 August 2009). "On the hunt for truffles in Western Australia". Los Angeles Times. Retrieved 2009-08-31. "Traditionally, truffle hunters — the Aussies call them "punters" — have used pigs to track their prey. More recently, punters have started using dogs, which, unlike pigs, will settle for a biscuit instead of chowing down on the truffle." 
  33. ^ http://in.lifestyle.yahoo.com/photos/top-5-world-s-most-expensive-ingredients-slideshow/expensive-ingredients-photo-290324533.html
  34. ^ a b Daniel Patterson (16 May 2007). "Hocus-Pocus, and a Beaker of Truffles". New York Times. Retrieved 2008-05-17. "Most commercial truffle oils are concocted by mixing olive oil with one or more compounds like 2,4-dithiapentane" 
  35. ^ "Truffle vodka article". Mycorrhizalsystems.com. 2010-04-21. Retrieved 2012-06-16. 

Notes[edit]

  • Trappe, Matt; Evans, Frank; Trappe, James M. (2007). Field Guide to North American Truffles: Hunting, Identifying, and Enjoying the World's Most Prized Fungi (136 pages). Natural History Series. Ten Speed Press. ISBN 9781580088626. 

External links[edit]