Prepare macaroni according to pkg. directions, rinse and drain well.
Drain kidney beans, leaving beans in can, and fill with vinegar. Let stand 1 hour. Drain off vinegar.
Mix together vegetables and add chopped onion, green pepper and celery.
Dressing: Mix half & half with sugar until sugar is dissolved. Add Miracle Whip and mustard.
Add dressing to vegetable mix, and let stand overnight.
Makes a very large salad and keeps well.