1/2 lb. butter, softened
2 tbsp. mustard
1 tbsp. Worcestershire sauce
2 tbsp. poppy seed
1 sm. onion, minced
1 lb. boiled ham, sliced
10 slices Swiss cheese
12 buns, split

Mix together butter, mustard, Worcestershire sauce, poppy seeds and onion. Spread on buns. Top with ham and cheese. Wrap in foil and heat in 350 degree oven 15 to 20 minutes.