2 lbs. hamburger
2 sm. onions
2 c. ketchup
2 tsp. vinegar
2 tsp. mustard
1 c. light brown sugar
2 tbsp. Worcestershire sauce

Brown hamburger; add remaining ingredients and simmer 10 minutes. Serve on buns.

For Variety: Open faced buns, cover with sloppy joe mixture, top with cole slaw, sliced cheese, tomatoes, lettuce, etc.