Heat the oil in a pan. Add the onions and leeks and cook over low heat for 5 minutes, or until softened.
Add the remaining vegetables, cover and cook for 10 minutes. Add the water and bouquet garni, bring to a boil, and simmer for 20 minutes.
Strain,cool, and store in the refrigerator. Use immediately or freeze in portions for up to 3 months.
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