Souper Burgers
["1 lb. ground beef", "1 medium onion, chopped", "1 can cream of celery soup", "2 Tbsp. ketchup or 1 Tbsp. prepared mustard", "1/8 tsp. pepper", "6 hamburger buns, split and toasted"]
["In skillet, cook beef and onion until beef is browned and onion is tender; stir to prepare meat.", "Spoon off fat.", "Add soup, ketchup and pepper.", "Over low heat, heat through; stir often. Serve on buns."]
["ground beef", "onion", "cream of celery soup", "ketchup", "pepper", "buns"]