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How to eat a bolete

Although I grew up equidistant from a large woodland and the local grocery store, I never would have thought that they contained some of the same products. The woods had carefully marked trails and swimming holes, the supermarket carefully marked bins of produce and even mushrooms. But the second week of my Field Mycology class, I collected my first bolete, something I’d thought I could only buy dried at my supermarket. The process of finding and eating boletes is much different in the wild than it is in civilization, so I’ll describe the path from the forest to the mouth for a delicious bolete.

A mouth-watering young specimen of Boletus edulisThe most coveted boletes belong to the Boletus edulis group (right), and are rarely found fresh in stores; generally only dried boletes appear. Unlike white button mushrooms, boletes are not saprobes that can grow on compost; they are mycorrhizal, forming relationships with trees. Due to the expense and complications of trying to cultivate a mushroom with a specific tree, there has been little success, so boletes are always collected from the wild, making them uncommon and expensive in supermarkets. However, the good news for collectors is that because they are mycorrhizal (symbiotic with certain trees), they will recur in the same places each year.

Boletus parasiticus on Scleroderma Because boletes are mostly water, dried boletes barely resemble fresh ones. While the dried boletes appear very similar to other dried mushrooms, fresh boletes are thick and fleshy, and distinct from other mushrooms because they have a thick sponge of tubes (often yellow) on the underside of the cap, instead of gills. However, although it is generally easy to recognize a mushroom as a bolete, identifying your bolete to species can be more difficult. This is an important step, because many boletes are either poisonous, or simply not pleasant to eat. (In France, pharmacists will check your mushrooms for you–all are trained in mycology).

My first bolete was Boletus parasiticus (at left). This mushroom is easily identified because it grows out of an earthball (Scleroderma sp.). Although it is not poisonous, one should be careful before eating it because the earthball is poisonous, and has powdery, easily distributed spores. Choice mushrooms from the genus Boletus include B. appendiculatus, B. regius, B. badius, B. erythropus, B. mirabilis, and B. zelleri. Other good edibles are found in other bolete genera, including Suillus, Leccinum, and others. Some are not so good, including, for example, the bitter boletes of the genus Tylopilus, (below) which will give you a belly ache, Boletus satanus and allies (anything named after the devil is likely to be poisonous), and a fatally poisonous Australian species of Rubinoboletus. [Editor's note: don't try to identify your boletes based on our story--consult a more comprehensive source like Michael Kuo's MushroomExpert.com, or Bessette et al.'s big bolete book2]

not for dinner: Tylopilus felleus, the bitter boleteOnce the mushrooms have been properly identified, it’s time to begin preparing them. Boletes rot quickly; any wet and mushy undersides or insect-filled stems should be discarded. The hard or fibrous stem of an older bolete should also be removed. The best boletes are small and firm. The choicest specimens can be served raw, thinly sliced with lemon juice and oil. However, there are a variety of cooking methods to best showcase the meaty flavor of boletes.

The classic French method includes three stages. First, the mushrooms are partially dried in the oven to remove some of the water. Then, they are stored in the exuded liquid, so that the flavor is not leached away. Finally, they are sauteed, to brown and cook them.

And though I may have seemed to disparage dried boletes as very unlike fresh boletes, dried boletes are not inferior. In fact, the distinct change that takes place during drying is seen by many as an improvement. The enzyme action and browning reactions that take place during drying give the dried bolete a powerful taste that can be used to infuse many foods with its umami flavor. And they last as long as a year.

Dried boletes should first be soaked for 30 minutes, and as with fresh boletes, the liquid is highly flavorful. When the rehydrated boletes are sauteed, they will have more flavor if they are cooked with the liquid. Although the texture of these are lacking, they are excellent for adding flavor to soups, or as flavoring in salads or meats. One interesting suggestion is to add a small amount of dried boletes to ordinary cultivated white mushrooms to give the dish a much richer and deeper flavor.

No matter how you eat ‘em, boletes will give your food a meaty and earthy flavor reminiscent of the forest they came from.

Please please don’t try to identify a king bolete from this article! Use one of the sources below or consult a knowledgeable mushroom expert. There are poisonous king bolete lookalikes in North America, in particular Boletus huronensis. Read more about this bad bolete in this personal poisoning tale by Andrus Voitk (McIlvainea 18: 32. 2009).

  1. Bessette Alan, Arleen Bessette, and David Fischer, Mushrooms of Northeastern North America. Syracuse University Press, 1997.
  2. Bessette, Alan E., William C. Roody, and Arleen R. Bessette. North American boletes : a color guide to the fleshy pored mushrooms. Syracuse University Press, 2000. [A great, big book of boletes that is worth buying if you're a bolete nut --Ed.]
  3. Davidson, Alan. The Oxford Companion to Food. Oxford University Press, 2006.
  4. Kuo, Michael (2002, June). The genus Boletus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/boletus.html
  5. McGee, Harold. On Food and Cooking. Scribner, 2004.
  6. Smith, Craig S. “Harvesting by the Basket What France’s Diners Crave.” The New York Times (Nov 16, 2006). Accessed 22 Oct. 2007
  7. Wolfert, Paula. The Cooking of Southwest France. John Wiley and Sons, Inc., 2005.
  8. Yun, Wang and Ian Hall. “Edible ectomycorrhizal mushrooms: challenges and achievements.” Canadian Journal of Botany 82.8 (2004): 1063-1074
  9. Pauli, J. L., and C. L. Foot. 2005. Fatal muscarinic syndrome after eating wild mushrooms. Medical Journal of Australia 182:294-295. [Rubinoboletus sp., Australia]

Image of B. parasiticus by Kent E. Loeffler
Image of B. edulis courtesy of Jared Grummer, a Cornell alum who now picks mushrooms in California.
Image of Tylopilus felleus by Kathie Hodge.

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Most people don't pay much attention to fungi, which include things like mushrooms, molds, yeasts, and mildews. Here at Cornell we think they're pretty fascinating. In fact, even the most disgusting foot diseases and moldy strawberries are dear to our hearts. We'd like to talk to you about fungi, so that like us, you too can tell gross stories at the dinner table. Afterwards, maybe you'll notice some things you would have overlooked before, and we think this could be good for the planet.

Kathie T. Hodge, Editor

Beneath Notice, our book of borescopic mycology.

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