Easy pizza sauce

Method

1. Heat a saucepan and add the extra-virgin olive oil. Gently fry the onion for 10 minutes, until softened and pale golden.
2. Add the garlic and chilli flakes, then cook for another 3 minutes.
3. Add the tomatoes, sugar and a splash of red wine vinegar. Season.
4. Add the stalks from a bunch of fresh basil (use the leaves as a pizza topping), bring to a very gentle simmer and cook for 45 minutes, stirring now and then.
5. Taste and adjust the seasoning, then blend until smooth. The sauce will keep in the fridge, covered, for 3-4 days or can be frozen for up to 1 month.