Preheat oven to 350° F. Turn beans into 1 1/2 qt. Baking dish. Gently stir in pineapple, onion, and mustard. Cut luncheon meat into quarters lengthwise, and then cut each piece in half crosswise, to make 3 1/2 x 3 1/2 inch pieces.
Score each, and arrange on beans, to make stripes. Stud each piece of meat with 2 or 3 cloves, and sprinkle with brown sugar. Bake uncovered, 30 minutes, or until beans are bubbling.Servings: 6