Tomato and Chilli Sauce

• 1 tablespoon olive oil
• 50 g/2 oz onion, chopped

Heat the oil in a pan and sweat the onion and garlic for 5 minutes, without browning. Add the tomatoes, chilli, basil, and salt to taste. Simmer gently for 20 minutes. Pass through a mouli légumes or sieve. Taste and adjust seasonings. Reheat if necessary when needed.