Melted Swiss and Ham Rolls

Ingredients:

1 cup Butter or margarine
3 tablespoon Mustard, Ground
3 tablespoon Poppy Seeds
1 Medium onion, finely diced
1 teaspoon Worcestershire sauce
4 Packages party rolls (in foil pan)
1 lb Ham, thinly sliced
12 ounce Swiss cheese, thinly sliced

Directions:
Preheat oven to 400 degrees. Combine butter, mustard, poppy seeds, onion and Worcestershire sauce. Set aside. Remove rolls intact from foil pans. Slice whole package of rolls horizontally through the middle. Return bottom layers to pans. Arrange ham and cheese on bottom layers and cover with top layer of rolls. Spread butter mixture over top of roll and put back on top of bottom rolls and cover tightly with aluminum foil. Bake 10 minutes and slice and serve.