12 hamburger buns
12 slices boiled ham
12 slices American cheese
1 1/2 sticks butter
2 tbsp. mustard
2 tbsp. onion
2 tbsp. poppy seed

Soften butter, add mustard, onion and poppy seed. Spread bottom bun with butter mixture, place ham and cheese spread mixture on cheese, top with top of bun. Bake at 350 degrees for 20 minutes.