Hed Tod Thai Truffle or Wild Mushroom - A truffle is one of a type of subterranean mushroom. Almost all truffles are ectomycorrhizal and are therefore usually found in close association with trees. The fruiting body of some are highly prized as a food: French gourmand Jean Anthelme Brillat-Savarin called them "the diamond of the kitchen". Thai truffles develop underground (Astreas hygrometricus) and are called Hed Tod or earthstars. .