Preheat oven to 350 degrees. In medium skillet, fry bacon until crisp. Remove from skillet; crumble and set aside. Drain all but about 2 tablespoons drippin gs from skillet; add sugar, vinegar, salt, and mustard. Simmer, uncovered, 10 minutes.
In large bowl, combine drained beans, 1/2 can onions and hot sugar mixture. Sp oon bean mixture into 9x13 inch baking dish. Bake, covered, at 350 degrees for 30 minutes or until heated through. Top with crumbled bacon and remaining oni ons; bake, uncovered, 5 minutes or until onions are golden brown. Makes 12 to 14 servings.
busted by sooz