Some thirty species of truffle are thought to exist however here at Le Gardian we're intending to lift only one - The Black Diamond (Tuber melanosporum) or Périgord truffle. The prized white truffle, typically known as the white diamond of Italy, grows from September to December. The second most expensive food on the earth, by weight, the truffle, is a uncommon delicacy and so identified because the King of Fungi. Mary-Frances Heck is a chef and freelance food editor, formerly a senior meals editor at Food & Wine. The unimaginable taste of a black truffle risotto is made much more luxurious when served with a dry white wine. As such, truffles can be quite expensive-making them an even more coveted ingredient. All quality truffle oil is made with genuine truffle extract that may put together you for including the total ingredient later.