1 (1/2 lb.) pkg. ham (4 long slices)
1 pkg. Swiss cheese (4 long slices)
3 pkgs. (24 each) ready to serve rolls

Cut ham and cheese in small pieces about the size of the rolls.

SAUCE:

1 stick butter
2 tbsp. sugar
1 tbsp. onion, grated
2 tbsp. poppy seed
2 tbsp. salad mustard
Salt and pepper to taste

Melt butter and add ingredients in order. Break pan of ready-to-serve rolls in 3 rows. Slice each row open; lay aside. Spread sauce on both sides; add a small slice of cheese and ham. Fold rolls back together and place back in pan until ready. Bake (if fresh rolls) at 250 degrees for 20 minutes. Can be made ahead and frozen.