The truffle has been known since ancient times; the Greek philosopher Plutarch even believed that it was the product of the combined action of water, heat and lightning. But it is in the Middle Ages and, above all, in the courts of the Italian Renaissance that the truffle was recognized as a noble food par excellence.truffles are a subway fungus, which grows near the roots of certain trees that are called truffle species, for example: oak or holm oak.the truffle is not in contact with the roots of the tree, it is joined to them by a mycelium that we do not perceive. The relationship between tree and truffle is a symbiosis, they associate with each other.truffles are found below the surface at about 20 cm deep.it is a product so rooted to the earth that, to extract the truffle, the dog's sense of smell is required, without them it is impossible to find the fungus at its optimum ripening time.there are up to thirty edible varieties of truffle, not all of them with culinary value.