Preheat oven to 350 degrees F. Grease a 9x13 baking dish. In a large bowl, combine butter, mustard,& worcestershire sauce. Add ham & cheese. Mix until well blended.
Slice the top half off of the rolls. DO NOT BREAK INTO INDIVIDUAL ROLLS. Place bottom half in a 9x13 pan. Spread the ham/cheese mixture evenly over the bottom half of the rolls in each pan. Place top half on rolls.
Bake in oven for around 15 minutes until rolls are golden brown and cheese has melted.