Mrs. (Chuck) Grassley's Three Bean Casserole

1 1/2 lb. ground beef
1 small onion
1 can pork and beans, do not drain
1 can butterbeans, do not drain
1 can kidney beans, do not drain

Sauce:
1 tsp. salt
1/4 cup brown sugar1/2 cup catsup
2 Tbsp. vinegar

Brown the beef and onion. Mix sauce together and stir into beef and onion. Add beans. Place in baking dish or pour into two casserole dishes and freeze one for future use. Bake at 350° for 30 minutes. Recipe makes 10-12 servings.