Step 1To make pizza sauce, heat olive oil in a large saucepan over medium heat. Sauté onion, celery and garlic for 2 minutes, then add tomatoes and cook for a further 5 minutes.
Step 2Stir in remaining ingredients. Bring to the boil, reduce heat and simmer for 15 minutes, or until sauce is thickened, stirring often. Remove bay leaf. Purée sauce and allow to cool.
Step 3Meanwhile, make pizza bases. Place the dried yeast, sugar and water in a large bowl. Set aside for 15 minutes, or until mixture turns frothy.
Step 4Sift flour and salt into the bowl of yeast mixture. Add olive oil and mix well. Turn the dough out onto a lightly floured chopping board or benchtop, and knead until the dough becomes smooth and elastic, or about 5 minutes. Return the dough to bowl, cover with a tea towel and place in a warm place until it has doubled in size, or about 30 minutes.
Step 5Preheat the oven to 220°C and line two large baking trays with a sheet of baking paper.
Step 6Punch down the dough, then knead again for 1 minute. Divide dough into 8 equal portions and form into balls. Press or roll out balls into 15–20cm pizza bases.
Step 7Place the pizza bases on the prepared baking trays and bake for 3–4 minutes to partially cook. Remove from the oven and leave to cool on wire racks.
Step 8Once cool, spread pizza sauce over bases and top with desired toppings.