1/2 c. soft butter
3 tbsp. mustard
1 lg. onion, grated
1 tbsp. Worcestershire sauce
1 lb. boiled ham, diced
1/2 lb. Swiss cheese, diced
4 pkgs. party rolls

Mix together butter, mustard, onion, Worcestershire sauce. Add ham and cheese. Fill sliced party rolls with mixture. Heat for 15 minutes at 350 degrees. Can be frozen and served later.