Black truffles are a highly sought-after underground fungus. Cultivated mostly in France, Spain and Italy during late autumn and winter, black truffles are usually sniffed out from underground by specially trained pigs, which are called truffle hogs. Most recently, however, truffle dogs have become the preferred species, because, unlike the hogs, they do not have the tendency to eat the discovered goods. The smell of black truffles is earthy, dense and powerful. It resembles fried sunflower seeds or walnuts. You can sniff some out for yourself at specialty stores and restaurants here in the US. Dean and Deluca sells black truffles by the pound as well as truffle infused salts, oils and foie gras. You’ll find that there are quite a few restaurants offering special menus or dishes focused on the seasonal delicacy.