Lighter Pizza Margherita

Name: Lighter Pizza Margherita
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Cuisine: Italian
Ingredients: 350g strong white flour , plus extra for dusting; 25g polenta or coarse semolina, plus 1 tsp; 7g sachet fast-action dried yeast; 1 tbsp olive oil; about 275ml/10fl oz hand-hot water; 400g can plum tomatoes; 3 garlic cloves , finely chopped; 1 tbsp tomato purée; 2 handfuls basil leaves; 50g mozzarella; 200g ricotta; 200g cherry tomatoes , halved; 25g rocket; 2 tbsp grated parmesan (or vegetarian alternative)