1 lb. hamburger
1 sm. onion, finely chopped
1/4 c. brown sugar, firmly packed
1 tbsp. Worcestershire sauce
1/2 (12 oz.) bottle chili sauce
1 tbsp. vinegar
1/2 c. ketchup

Brown hamburger and onion. Add remaining ingredients and bring to simmering temperature. Cook, stirring occasionally, for 25 to 30 minutes.