Baked Bean Casserole

Ingredients

• 1 1/2 lb. ground beef
• 1 c. onions, chopped
• 2 (16 oz.) cans pork and beans
• 1 can kidney beans, drained
• 1 c. catsup
• 1/4 c. brown sugar
• 2 tsp. vinegar
• 2 Tbsp. mustard
• 1/2 tsp. salt