They can be coated in chocolate or a wide range of different toppings. Another standard variety is the recent black truffle, which is prized for its earthy taste and pungent aroma. Black and burgundy truffles can final for one to two weeks if properly saved, while white truffles needs to be loved within five days. For context, the uncommon and extremely sought after white Alba truffle can promote for over $2,000 a pound, whereas black truffle can run you over $300 a pound. With out a scale version: You might want to heat the cocoa butter on its own first either over a double boiler or the microwave.