Skillet Beef Tenderloin... Skillet Beef Tenderloin   Ingredients 4 6 ounces beef tenderloin steaks (1/2- to 3/4-inch thick) 1 tablespoon butter 1 teaspoon olive oil 4 shallots, halved if large, or 1/2 medium red onion cut in wedges 2 tablespoons cognac, brandy, or dry red wine 1/2 cup beef broth 1 tablespoon butter, softened Snipped