2 lbs. hamburger
1/4 c. onion
3/4 c. ketchup
3/4 c. water
2 tbsp. vinegar
2 tbsp. Worcestershire sauce
2 tbsp. mustard
1 can chicken gumbo soup

Brown hamburger and onions. Mix in remaining ingredients; bring to a boil. Simmer approximately 20 minutes. Serve over grilled hamburger buns.