3 crusted truffle sauce Recipes

whole beef tenderloin , trimmed of fat, silverskin, and the chain (see cooks notes); or a 5- to 5 1/2-pound well-trimmed tenderloin roast, salt, freshly ground black pepper, olive oil, divided, dried porcini mushrooms, ground to a powder in a blender, black-truffle butter, softened, all-purpose flour, crimini (baby bella) mushrooms, trimmed and quartered into wedges, beef stock or low-sodium broth, divided, chopped scallion greens

olive oil, chopped onions, salt, freshly ground white pepper, freshly ground black pepper, chicken stock, chopped garlic, arborio rice, assorted exotic mushrooms , such shiitakes, chanterelles, or oysters, wiped clean and chopped (about 2 cups), butter, heavy cream, freshly grated parmigiano-reggiano cheese, chopped green onions, green part only, white truffle oil, black truffle , for shaving, egg, fresh lemon juice, vegetable oil, dijon mustard, hot pepper sauce, salt, freshly grated parmigiano-reggiano cheese, freshly ground black pepper, white truffle oil, day-old white bread, crusts removed