Fatfree 3 bean salad

1 pound fresh green beans, 1" pieces, steamed until tender & cooled
 1 15-16oz can garbanzos
 1 15-16oz can kidney beans
 1 large red onion, coarsley chopped
 1/2 cup seasoned rice vinegar
 
 Combine all ingredients in a sealed plastic container and shake well.
 Let sit in fridge overnight, gets better with age, up to 10 days in the
 fridge.