1 dozen hamburger buns
1/4 lb. butter, very soft
1/4 c. chopped onion
1 tbsp. regular mustard
1 tbsp. poppy seed
1 tsp. accent

Mix ingredients to make sauce. Use a tablespoon of sauce on top of double thickness of Swiss cheese. Boiled ham on bottom. Wrap in aluminum foil squares. Bake at 350 degrees for 30 minutes.