Heat the oven to 400 degrees.
On a lightly floured surface, roll the pizza dough out to a 8x16 rectangle.
Brush the dough with some butter.
Layer the ham and then the cheese on the dough.
Roll the dough up tightly into a long log shape.
Cut the log into 9 evenly sized slices.
Lay the slices in a well greased 9x9 baking dish, and allow to rise for 20 minutes.
Blend together the remaining melted butter with the worcestershire sauce, poppy seeds and minced onion.
Pour the sauce over the rolls and bake for 30-40 minutes.