Preheat your pizza stone (on the grill) for at least 15 minutes before doing anything else — the hotter, the better.
Fully cook the sausage in a sauté pan.
Dust your surface with semolina flour. Roll out the dough with a rolling pin or your hands — if it's sticky, a little olive oil on your hands helps. Keep the semolina to the bottom of the dough only, not the face.
Spoon the pizza sauce over the dough — a little goes a long way.
Top with the cooked sausage.
Add the torn mozzarella.
Finish with Italian seasoning, garlic salt, and chili flakes if using.
Slide the pizza onto the hot stone using a peel or paddle, and close the lid. Check after 3 minutes and continue cooking to your preferred crispiness.