Fry 8 slices thick bacon, rain and set aside. In bacon grease fry 3 large onions in rings until transparent. Add:

3/4 c. brown sugar
1 tsp. dry mustard
1/2 tsp. garlic powder
Salt
1/2 c. cider vinegar

Simmer covered for 30 minutes. In large casserole mix:

2 (15 oz.) cans butter beans, drained
1 (15 oz.) can green lima beans, drained
1 (15 oz.) can kidney beans, drained
1 lb. 11 oz. can Boston Baked Beans
1/2 sm. bottle ketchup

Add cooked sauce and crumbled bacon to mixed beans. Bake at 350 degrees for 1 to 1 1/2 hours.