Lay Pizza Crust out on Countertop and roll out so its about 1/4 inch thick all the way around and square in shape.
Spread a layer of Mayo on top of crust stayng about an inch away from the edges.
Next Layer Cheese on top of Mayo, add as much as you like, 1 - 1 1/2 cups is about right.
Now layer the Salami over the cheese.
Next layer the Ham over the Salami.
Finally layer the sauted onions on top of the salami.
Starting at the edge closest to you, start to roll the dough tightly until all the toppings are enclosed in the middle, and seal the seam along the bottom and on the ends by pinching the dough together.
Brush the top of the dough with melted butter and sprinkle poppy seeds on top.
Cut a few slits in the top to let moisture escape.
Put loaf on baking pan and bake at 350 degrees for about 30 minute.