1/4 c. soft butter
2 tbsp. prepared horseradish mustard
2 tsp. poppy seed
2 tbsp. onion, finely chopped
Swiss cheese
Hamburger buns
Ham

Mix together and spread on cut sides of hamburger buns. Put a slice of ham and a slice of Swiss cheese on each bun. Put on other half of bun and wrap in aluminum foil. Bake on cookie sheet at 350 degrees for 20 minutes. Yield 4 servings.