1 lb. hamburger
1 med. onion, diced
1 lg. can pork and beans
1 sm. can kidney beans
1 c. ketchup
2 tsp. mustard
1 c. brown sugar
1 tsp. vinegar

Brown hamburger and onion. Drain. Combine with remaining ingredients in large baking dish. Bake at 425 degrees for 55 minutes.