1/3 lb. butter
3 tbsp. poppy seeds
3 tbsp. prepared mustard
1 tsp. Worcestershire sauce
1 med. onion, chopped fine
3 pans Pepperidge Farm party rolls
3 pkg. sandwich ham
1/3 lb. Swiss cheese

Blend first 5 ingredients. Split rolls and spread above mixture. Add ham and cheese. (Can freeze at this stage.) Bake at 400 degrees for 10 to 15 minutes before serving.