Pre-heat and light your grill. If using charcoal or wood allow the flame to die down. Also, make sure the grates are clean.
For the pizza, start by dusting flour on a clean workable surface. Place the pizza dough onto the clean workable surface and dust with more flour gently. This is a fun time to get the kids involved by having them help stretch out and press down the pizza until it is thin and round. Or you can also use a rolling pin if needed.
Lightly sprinkle the semolina or corn meal over the pizza peel or cookie pan then place dough on top.
Carefully slide the pizza onto the grill, cover with lid and cook for 3-4 min then flip over on the other slide, as you would a burger. Place the chocolate then marshmallows on top, then close the lid and allow to cook for 2-3 min. The chocolate should be melted and the marshmallows starting to weep.
Using the pizza peel, remove the pizza from the grill. Cut into 4-6 slices and serve.
If you want to get crazy, fold it in half like a taco instead of cutting it.