1/2 lb. soft butter
3 tbsp. prepared mustard
1 1/2 tbsp. poppy seed
1 tsp. Worcestershire sauce
1 onion, grated
12 bakery style sandwich rolls, sliced
1 lb. deli ham, shaved
12 slices Swiss cheese

Mix first 5 ingredients. Spread mixture on both sides of roll. Place ham and cheese on rolls. Wrap in foil. Heat 10 minutes at 400 degrees. Can be stretched to make 16 sandwiches. May be made ahead and refrigerated. If so, heat 15 minutes instead of 10 minutes.