2 tbsp. fat
1 lb. ground beef
2/3 c. chopped onion
1/2 tsp. salt
Dash pepper
1/4 c. water
1 can condensed chicken gumbo soup
1 tbsp. catsup
1 tbsp. prepared mustard
8 hamburger buns

Cook meat and onion together in hot fat until meat is lightly browned. Add other ingredients. Cover; simmer over low heat 30 minutes, stir occasionally.