Place the strong white bread flour, sourdough, tepid water, sea salt and olive oil into a bowl. Mix until a rough dough forms.
Tip onto a work surface and knead for 8–10 minutes until smooth, elastic and slightly tacky. Cover and leave to prove for 1 hour, or until risen.
Meanwhile, make the sauce. Place the tomato puree, chopped tomatoes, oregano, sugar and garlic, if using, into a bowl and mix well.
If using vegetables or cured meats with a high water content, cook them briefly in a pan to remove excess moisture.
Divide the dough into equal portions and shape into dough balls. Lightly dust the work surface or trays with semolina, then stretch each dough ball into a pizza base.
Spoon a thin layer of sauce over each base, leaving a small border around the edge.
Add the mozzarella and your chosen toppings. Season with sea salt and cracked black pepper.
Bake in a preheated oven at 250°C for 6–8 minutes, until the base is crisp, the crust is risen and lightly charred, and the toppings are cooked through.