Black winter truffles, also known as Périgord truffles. Périgord truffle is normally round, and slightly bumpy. The flesh is noir/violet at maturity, with fine veins that are well marked and divided. White when cut open, the flesh turns red on contact with air. It grows in hilly areas in symbiosis with hazelnut and oak trees.  To the nose the perfume is of a dry mushroom, humus, and wet forests. In the mouth the truffle is crunchy and soft simultaneously; at first spicy with a slight taste of black radish, then a hint of ha