Another lovely recipe from Encyclopedia of Cooking by Mary Margaret McBride . Once again I cut the salt in 1/2 and used Mrs. Dash instead. Hamburger Tuck-ins 1 pound ground beef 1 teaspoon salt 1/8 teaspoon pepper 2 teaspoons Worcestershire sauce 4 tablespoons finely chopped onion Mix ground beef with salt and pepper. Shape into 8 thin patties. Combine Worcestershire sauce and onion. On each of 4 patties, place 1 tablespoon chopped onion. Top with a second patty and pinch edges together well. Pan fry or broil about 15 minutes, turning once. Serves 4.