1 stick butter
1 tsp. dry mustard
2 tsp. poppyseed
1 tsp. grated onion
12 buttercrust buns
24 thin slices ham
12 slices American, Swiss or Munchee cheese

Make a paste of the first four ingredients and spread on buns, add two slices of ham and one slice cheese to each. Wrap each sandwich tightly in foil and refrigerate. Even overnight! Bake at 350 degrees for 15 minutes.