3 beef wellington fillet Recipes

a 3 1/2-lb fillet of beef tied with thin sheets of larding fat at room temperature, mushrooms, chopped fine, unsalted butter, de foie gras (available at specialty foods shops) at room temperature, puff paste or thawed frozen puff pastry plus additional for garnish if desired, egg white beaten, an egg wash made by beating 1 large egg yolk with 1 tsp of water, sercial madeira, arrowroot dissolved in 1 tsp cold water, beef broth, chopped black truffles (available at specialty food shops) if desired, watercress for garnish if desired

butter or margarine, divided, beef tenderloin fillets, 1-inch thick, salt, pepper, fresh mushrooms, chopped, fresh mushrooms, chopped, dry sherry or beef broth, frozen puff pastry sheets, thawed, egg white, lightly beaten, butter or margarine, all-purpose flour, tomato paste, beef broth, bay leaf, crushed