Preheat the Artisan Fire Pizza Oven with both burners on HIGH.
To make the barbecue rub, combine the onion and garlic in a spice mill and grind to the desired texture. Grinding the chopped spices yourself makes for a more flavorful rub. Add the sugar, salt, paprika and pepper.
Peel and devein the shrimp, leaving the tails on. Partially butterfly the shrimp while you are deveining them.
Season the shrimp liberally with the barbecue rub.
For maximum flavor, you can lightly pre-char the boards quickly on a hot grill. This step is optional.
Arrange the shrimp on the cedar planks. Trim the green onions and arrange them alongside the shrimp.
Cedar-planked shrimp roasting in the Artisan Fire Pizza Oven
Place the cooling rack(s) in the pizza oven, and position the cedar planks on top of the rack(s). This helps keep the boards from burning too quickly.
Cook for 12 to 15 minutes, rotating the boards several times for even cooking. Keep a spray bottle of drinking water handy to douse any flames that might erupt at the edges or corners of the board.
Tip: Most pre-packaged cedar planks for cooking are thinner than we like to use. For cedar planks (and any other type of wood) we prefer to purchase 1x8 boards (a 1x8 is actually ¾ inch thick and 7 inches wide), and cut them down to the desired length. If you don’t have a saw at home, the hardware store or lumber yard will usually be happy to cut them for you.