Place the
tomatoes, onions, celery and garlic in a saucepan
with the oil. Cover with a tight-fitting lid and
cook over a gentle heat for 40-45minutes, shaking
the pan occasionally, until the vegetables become
very soft.
Spoon the
vegetables into a food processor or blender and
process until smooth. Press through a sieve to
remove the tomato pips, then return to the pan.
Stir in the
stock and tomato puree and bring to the boil. Add
the pasta and simmer gently for about 8 minutes, or
until the pasta is tender.
Add salt and pepper to
taste, then sprinkle with coriander or parsley to
garnish and serve hot.