Sprinkle half of the semolina onto a clean surface. Sprinkle the flour onto a rolling pin and roll out the dough balls, then allow them to rest for 3 min. After 3 min, continue to roll out the dough until roughly the size of a dinner plate. Sprinkle the remaining semolina onto the pre-heated baking trays. Carefully transfer the rolled-out dough onto the pre-heated trays.