method
Heat the oil in a saucepan. Cook the garlic and onions over a low heat for about 4 minutes until transparent.
Remove the strings from the celery stalk and chop into small pieces, then add to the onion and garlic for the last 2 minutes.
Add all the other ingredients, bring to the boil and simmer for 40 minutes on a low heat.
Remove the sprig of parsley, bay leaf and bouquet garni and serve as cooked, or the sauce may be partially blended if a smoother texture is preferred.
serving amount
makes approx. 600 ml (1 pt)
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