1 lb. cooked hamburger
1 can tomato soup
1/3 c. onion
1 tbsp. mustard
1 tsp. Worcestershire sauce
1 tsp. horseradish
1 tsp. salt

Combine above ingredients. Open hamburger buns, toast under broiler. Spread above mixture on toasted buns. Top with sliced tomato and slice of American cheese. Broil until cheese is melted and slightly browned.