Grab your leftover dough (if it's been in the fridge, let it sit out for a bit to warm up as it will be easier to work with).
Gently roll the dough out into a rectangle. 60cm x 30cm is a good size to aim for. It doesn't have to be perfect, but the bigger you an get it, to more perfect swirls you will get.
Spread the pizza sauce over the dough, leaving a 5cm gap on one of the long edges. You need to leave a gap so that dough will stick to itself when you roll it.
Now sprinkle over the mozzarella, bacon and pepperoni so that it covers the area of dough spread with the sauce.
Once the filling is spread, roll the dough into a log, starting on the opposite long edge to the gap you've left.
Roll the dough into a tight log, using the unfilled dough to seal the log. You can spray a little water on the part where the dough joins if you want to - but the dough should stick to itself without it.Lay the log out with the seam underneath. Sprinkle some semolina flour if the dough seems a bit sticky. Cut the log into 3cm pieces. I use the side of my knife to roughly measure. Using dental floss to cut them will help you keep their shape and give the rolls a flat surface, but using a knife is totally fine too!
Place the sourdough pizza rolls onto a baking sheet lined with parchment paper. You can also make these in a cast iron skillet if you prefer, but they will join together.