Make the pizza dough. Add the salt, sugar and yeast to a bowl (seperately), add the water and oil then bring together with your hands until you have a craggy mass. Rest for 3 minutes, turn out and knead for 8-10 minutes, or until smooth and springy. Cover with clingfilm and leave to proof for 45 minutes-1 hour.
Knock back, remove from bowl and divide into two. Shape into a ball and place on a baking sheet. Slash with a sharp knife and stuff the holes with mozzarella. Top with pizza sauce, pepperoni, a little more olive oil and oregano.
Bake at 240°C for 15 minutes, or until cooked through and risen.