Filet Mignon with butter

4 (6 ounce) beef tenderloin steaks , cut 1 1/4 inch thick, trimmed salt and pepper 1/3 lb fresh mushrooms , minced 2 ounces cooked ham , ground 3 shallots ,[...]

4 (4 -6 ounce) beef tenderloin steaks , cut 1 inch thick (about 1 lb total) 3 tablespoons cognac or 3 tablespoons brandy 1/2 teaspoon ground black pepper 1[...]

3 1/2 tablespoons unsalted butter 1 tablespoon all-purpose flour 1 cup beef stock or 1 cup store bought broth 1 lb beef tenderloin , trimmed sliced 1/4 inch[...]