Lay out the pre-made pie crust on the STOK pizza stone. Spread the contents of the jar of Nutella using a rubber spatula on all but the outer 2 inches of the pie crust. Gently fold the outside lip of the crust toward the center, creating a freestanding pie.
Place pizza stone in the grill on top of one of the grill grate inserts. Grill for 40-60 minutes, until pie crust is golden on both the top and bottom. Keep a close eye on it. If the top browns too quickly before the bottom has finished, cover with aluminum foil until the bottom is complete.
Mix together sliced strawberries and sugar. Bring to a simmer on the stovetop, simmering for about 3 minutes. Remove from heat and allow to stand while crust finishes cooking.
Once the crust is lightly browned on top and bottom, remove from heat. Use a slotted spoon to ladle the strawberry mixture over the top of the pie, discarding the extra juices.
Garnish with powdered sugar, cut and serve immediately
