1 (53 oz.) can pork & beans
1/2 c. catsup
3 tbsp. vinegar
2 tsp. prepared mustard
1 1/2 c. chopped onion

Saute onions; add to the rest of the ingredients. Combine in 3 quart casserole dish. Bake 1 hour at 375 degrees. 12 (1/2 cup) servings.