1- lb. ground beef
2- 15 oz. cans pork and beans
1- 15 oz. can red kidney beans, drained
1 c. ketchup
1 tsp. cider vinegar
1/2 c. brown sugar
2 tbsp. butter
2 tbsp. mustard
1 small onion, chopped

In a large skillet, melt butter and brown meat. Stir in remaining ingredients. Pour into a 2 1/2 quart casserole dish.

Bake at 350°F for 20 minutes.