1 1/2 sticks butter
1 1/2 tbsp. wet mustard
1 sm. Bermuda onion, grated
1 tbsp. poppy seed
1 tbsp. Worcestershire sauce
1 lb. shaved baked ham
1 1/2 lb. shaved Swiss cheese

Spread mixture on both sides of 12 buns. Layer the meat and cheese. Wrap in foil. Bake at 325 degrees for 20 minutes.