1 1/2 lb. ground beef
1 can tomato soup (10 3/4 oz.)
1/3 c. onion
1 tbsp. mustard
1 tbsp. Worcestershire sauce
1 tsp. horseradish
1 tsp. salt

Mix all ingredients. Spread evenly on toasted buns. Cover edges completely. Broil about 4 inches from heat for 15 minutes. Top with cheese and melt it.