Cut ham slices in half. Cut cheese into strips.
Preheat oven to 325.
Beat butter, onion, poppy seeds, mustard and worchestershire together in small bowl. Split rolls. Spread butter mixture on both cut sides of rolls. Place one piece of ham and 1 slice cheese on bottom half of each roll. Replace tops and place on cookie sheet. Cover loosely with foil and bake 15 minutes or until cheese begins to melt.
These freeze very well.