1/2 lb. softened butter
3 tbsp. mustard
3 tbsp. poppy seed
1 small onion, chopped
1 tsp. Worcestershire sauce
3 doz. Dainty dinner rolls
1 lb. boiled ham, sliced very thin
3/4 lb. Swiss cheese, sliced thin

Blend first 5 ingredients together. Split dinner rolls. Spread tops and bottoms with mixture. Add ham and cheese to bottom of dinner roll. Cover with top bread. Then cover in foil and bake for 10 minutes at 400°F.