Black Truffle Burger: A cheeseburger with Gruyère, black truffle sauce made with real truffle oil, and crispy candy onions on a toasted potato bun. Can I take advantage of a special sort of potato to make this dish? They need to make these high-high quality foods available to all. As we started to find the world of truffles, it turned clear that we had to make a parasite; like the truffle that feeds on the host tree. However, relatively few landowners harvest the truffles, both because they aren't conscious that they have them or because they aren't conscious of or involved in their industrial potential.