Chop the onion, carrot, celery and garlic. Heat the oil over medium heat in a large saucepan. Add the vegetables and potatoes, season well, the reduce the heat and cover the pan.Gently cook for about 5 mins until starting to soften, then add the stock, turn up the heat and bring to the boiol. Simmer for 5 mins more, until the vegatbles are tender.
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