In this season of outdoor cooking, even pizza can be cooked on the grill. Here’s the basic technique, according to flourgirl: Place the crust on the grill over medium heat and close the lid; let it cook for about 3 minutes, then remove with tongs and flip it over onto a pizza peel with the uncooked side down. Add your toppings and return the pizza to grill over indirect heat with the lid down until the bottom is golden brown and the cheese is melted. todao suggests using tongs to check the bottom of the crust frequently to avoid overbrowning.
firecooked says that after you roll out your pizza dough, you can place the rounds on parchment paper (you can even stack them that way); then you can easily flip a round onto the grill upside down and peel the paper off. Cheesy Oysters finds it easier to make smaller, individual pizzas on the grill. Finally, jesoda notes that vegetables such as onions, peppers, and mushrooms should be precooked because they won’t have time to cook on the grill before the pizza is done.
Board Link: Grilled Pizza Questions and Help