1 lb. ground beef
1/2 c. chopped onion
1/2 tsp. salt
1/4 tsp. pepper
2 tbsp. vinegar
2 tbsp. sugar
1/2 c. ketchup
1 can (31 oz.) pork and beans

Brown ground beef and onions in skillet. Remove from heat and drain. Add other ingredients and pour into a 1 1/2 quart casserole.

Bake at 350°F for 30 minutes or 10 to 12 minutes on high in a microwave.