1 pkg. hamburger buns
8 slices of Bavarian ham
8 slices Swiss cheese
3 tsp. French's mustard
1 tbsp. horseradish
1/2 c. butter
1/4 c. grated onion

Mix mustard, horseradish and butter. Add grated onion. Spread mixture on each side of open bun. Place 1 slice of ham and cheese on each bun. Wrap buns in aluminum foil and freeze. To use, take out of freezer and place in a 350 degree oven for 25 to 30 minutes.