Preheat Wok and Pizza Stone Inserts to low heat, between 200°F -250°F, on the STOK® Grill. If using the STOK® Tower, click here for heating tips.
If you are using a single insert grill grate model, insert the Wok only.
To cook onions (optional): In Wok, add butter and onions and sauté onions until softened and translucent. This will take about 8-10 minutes. Remove onions and place onto paper-towel lined plate. Carefully, wipe out Wok with paper towel.
Add hamburger meat to Wok Insert and cook over medium heat, 300°F -350°F until browned thoroughly. While cooking, season the meat with salt, pepper and garlic powder.
When meat is finished cooking, remove Wok from the grill. Drain excess fat from meat and let cool.
If using a single insert grill, insert the Pizza Stone now. Use two oven mitts to do this in order to avoid injury.
Follow directions on pizza dough package. Dust a pizza peel with cornmeal and lay the dough on top.
Using a spoon, spread mustard all over dough, leaving a ½" border. Sprinkle hamburger meat and onions all over the mustard. Now sprinkle the cheeses over the meat.
Once the grill is heated, use a pizza peel or thin cutting board to transfer the pizza to the Pizza Stone, close the grill lid and cook until crust is golden brown, about 15-20 minutes.
Remove with pizza peel and serve.