Hawaiian Baked Beans

great northern beans, rinsed and drained

chopped onion

1 ⁄4 cups brown sugar

⁄2 lb cubed cooked ham ((cubed ham steak works well))

⁄4 cup ketchup

crushed pineapple (, drained well)

pineapple tidbits (, drained well)

prepared mustard

1 ⁄2 tablespoons cider vinegar