Grandma'S Baked Beans
["4 (16 oz.) cans pork and beans", "1/2 c. brown sugar", "4 medium onions, chopped", "1 1/2 c. ketchup", "4 tsp. vinegar", "1/4 c. bacon drippings or cooking oil (optional)"]
["Combine all ingredients and pour into a 9 x 13-inch baking pan.", "Bake at 350\u00b0 for about 1 hour.", "Serves 14."]
["pork", "brown sugar", "onions", "ketchup", "vinegar", "bacon"]