Dijon Beef Tenderloin Recipe

Sprinkle steaks with salt and pepper. In a large skillet, heat 2 tablespoons butter over medium-high heat. Add steaks; cook 4-6 minutes on each side or until meat reaches desired doneness (for medium-rare, a thermometer should read 145 °; medium, 160 °; well-done, 170 °). Remove from pan; keep warm. In same pan, heat 1 tablespoon butter over medium heat. Add onion; cook and stir 4-6 minutes or until tender. Stir in stock; bring to a boil. Cook 1-2 minutes or until liquid is reduced by half. Stir in mustard; remove from heat. Cube remaining butter; stir into sauce just until blended. Serve with steaks.