Stuffed Burgers on Portabellos Recipe

In a large bowl, combine the Worcestershire sauce, salt and pepper. Crumble beef over mixture; mix well. Shape into eight thin patties. Combine cheese and bacon. Spoon into center of four patties. Top with remaining patties; press edges firmly to seal. Grill, covered, over medium heat for 6 minutes on each side or until a meat thermometer reads 160° and juices run clear. Meanwhile, remove mushroom stems if necessary; brush with oil. Grill, covered, over medium heat for 3-4 minutes on each side or until tender. Place mushrooms, rounded side down, on serving plates. Top each with tomato, lettuce and a burger. Yield: 4 servings.