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Heat the oil in a large non-stick pan and fry the onions for a few minutes. Add the carrots, celery and garlic, then fry for 5 minutes, stirring until the vegetables start to soften.
Heat the oil in a large non-stick pan and fry the onions for a few minutes. Add the carrots, celery and garlic, then fry for 5 minutes, stirring until the vegetables start to soften.