1 stick of butter softened
2 teaspoons yellow mustard
2 tablespoons poppy seeds
2 teaspoons Worcestershire sauce
1 small onion finely chopped (around 1/4 cup)
1 package of party rolls (the long and skinny ones)
1 4 to 5 oz package of shaved deli ham
1 4 oz package of sliced Swiss Cheese (almost shaved)
Preheat oven to 350F.
Mix together first 5 ingredients in a small bowl. Slice whole package of party rolls in half. Spread both sides of rolls with the mustard mixture. Top one side of the with small pieces of ham. Cover ham with Swiss Cheese.
Place the rolls on a baking sheet. Heat in the oven until cheese is melted (around 10 minutes). Remove and cool. Once the rolls have cooled, cut them apart.