Heat the oil in a small pan over a medium heat. Add the onion and fry gently for 3-4 minutes, until softened. Add the garlic and sun-dried tomato paste and cook for a further minute.
Tip in the cartons of chopped tomatoes. Bring to the boil, then lower the heat and simmer for 30 minutes, stirring regularly.
Bolognese; or as a sauce for grilled fish.