3 lbs. hamburger
1 onion
1/3 tsp. salt
1/3 tsp. pepper

In bowl:

1 c. ketchup
1 tsp. dry mustard
3 tbsp. Worcestershire sauce
3 tbsp. vinegar

Mix hamburger, onions and salt and pepper together. Make patties and brown. Layer hamburgers in pan. Layer onions and hamburgers again. In bowl mix, ketchup, dry mustard, Worcestershire sauce and vinegar. Pour over hamburger and let simmer 1 hour.