Serious Eats: Recipes
Cook the Book: Fleur Burger with Truffles
The truffles are optional on this burger, which is good because you probably don't have any lying around. But you can replace it with other wild mushrooms for that earthy flavor. Keller changes his restaurant version in this recipe by replacing the foie gras with a tart pickled onion topping, a good foil for the rich meat and wine sauce.