1/4 c. soft butter
2 tbsp. horseradish
2 tbsp. mustard
4 tsp. poppy seeds
2 tbsp. finely chopped onion
12 rolls
1/2 lb. boiled ham
1/2 lb. Swiss cheese

Mix butter and next four ingredients, spread on buns. Divide ham and cheese onto buns. Arrange sandwiches on baking sheet. Cover loosely with foil and bake until heated through.