Ingredients:

• 1 - 15 oz. can black beans
• 1 - 15 oz. can kidney beans
• 1 - 15 oz. can northern beans
• 1 large onion, chopped
• 1/4 cup catsup
• 1/4 cup packed brown sugar
• 1 tsp salt
• 1 to 2 tsp prepared mustard
• 2 tsp white distilled vinegar