In your oven:
Preheat to 450°. Bake directly on the oven rack or on a pizza stone (the pizza stone must be 450 degrees or hotter for at least 45 minutes). Cook 8 to 10 minutes. Do not use a pizza pan (even a perforated one), sheet pan or anything else to cook these pizzas.
On your outdoor gas grill:
Preheat to 450° then turn one half of the grill very low and leave the other side on high heat. Cook pizza on low half of the grill, lid closed, checking often to be sure pizza is getting charred but not burnt. You may need to rotate the pizza to cook it evenly.