Heat the oil in a large saucepan over a medium heat, add the onion and fry for 2–3 minutes, then add the garlic and fry for another minute before adding the carrot, celery, courgette and red pepper.
Pour in the stock and passata and stir well. Add the tomato purée, dried herbs and smoked paprika and bring to the boil, then reduce the heat and simmer for about 2