- 1/4 cup butter or margarine, softened
- 2 tablespoons horseradish mustard
- 2 tablespoons finely chopped onion
- 2 teaspoons poppy seeds
- 4 hamburger buns, split
- 8 slices fully cooked ham
- 4 slices Swiss cheese
- In a bowl, combine the butter, mustard, onion and poppy seeds. Spread over cut sides of buns. Layer ham and cheese on bottom halves; replace tops. Wrap each sandwich in foil; place on a baking sheet.
- Bake at 350 degrees for 25-30 minutes or until cheese is melted.