Baked Bean Casserole
["1 Tbsp. salad oil", "1 c. onion, diced", "1/2 c. tomato ketchup", "1 (15 1/2 oz.) can butter beans, drained", "1/2 c. brown sugar", "1 (15 1/2 oz.) can kidney beans, drained", "1 (18 oz.) jar Boston baked beans", "2 Tbsp. vinegar", "1 Tbsp. mustard", "1/2 lb. or 1 1/2 c. Canadian style bacon, diced (optional)"]
["Saute onion in oil.", "Combine all remaining ingredients in large bowl; add onion and mix thoroughly.", "Put into a 2-quart casserole and bake, uncovered, in preheated 350\u00b0 oven for 1 1/2 hours."]
["salad oil", "onion", "tomato ketchup", "butter beans", "brown sugar", "kidney beans", "beans", "vinegar", "mustard", "Canadian style bacon"]