1/4 c. grated onion
1/2 c. melted butter
1 tbsp. prepared mustard
2 tbsp. poppy seed
Boiled ham slices
Swiss cheese slices
Hamburger buns

Mix onion, butter, mustard, and poppy seed. Let stand to let flavors mix. Spread on top and bottom buns. Then place a ham slice, then cheese, then ham on each bun in that order. Wrap in foil and refrigerate the day before serving. Let stand room temperature a few hours, then place in 350 degree oven for 15 to 20 minutes.