1 c. butter, softened
2 tbsp. dry mustard
3 tbsp. poppy seeds
1 med. onion, diced finely
1 tsp. Worcestershire sauce
4 pkgs. party rolls
12 oz. Swiss cheese, sliced thinly
12 oz. ham, sliced thinly

Mix first 5 ingredients well. Spread on rolls. Cut ham and cheese to fit rolls. Place one slice of each on each roll. Wrap in foil. Heat at 400 degrees for 10 minutes. These freeze well before being cooked. Heat for 20 minutes if they are frozen. Serves 15 to 20.