2 (15 1/2 oz.) cans baked beans
1/4 c. catsup
1 tbsp. French's mustard
2 tbsp. chopped onion
1/2 c. Karo syrup

Mix above ingredients. Pour into casserole. Bake at 350 degrees for 1 hour. Stir frequently or microwave at "bake" setting 15 minutes. Stir often. Beans should be thickened and turned a dark red. Enjoy.