2 tbsp. cooking oil
1 lb. ground beef
1 c. catsup
2 tsp. cider vinegar
2 c. chopped onion
1 tsp. salt
2 tbsp. prepared mustard
1 can kidney beans, drained
2 cans pork and beans (in tomato sauce)

Simmer onions in oil until golden. Add beef. Stir with a fork while onions brown lightly. Add remaining ingredients. Pour into a casserole dish.

Bake at 400°F for 30 minutes.