THE RIVER CAFE'S WINTER MINESTRONE

Steps:

• Heat the olive oil in a large saucepan and slowly fry the carrots, onion and celery until soft and dark. This will take about 20 minutes but it's worth it - the slow cooking gives a lovely taste. Add the garlic, chard stalks and half the parsley, and stir to prevent sticking. Stir in the tomatoes and cook for 10 minutes or until reduced.
• Add half the Swiss chard leaves, half the cavolo nero, three-quarters of the beans, and the boiling stock. Bring to the boil, then reduce the heat. Simmer for 30 minutes. Pour in more stock if needed - don't add too much - it should be thick.
• Add the remaining Swiss chard and cavolo nero and blanch briefly so they remain green and crisp. Season when slightly cooled.
• Purée the remaining cannellini beans coarsely in a blender with some of the cooking liquid. Add to the soup - it should be very green. Stir in the herbs and serve hot with Parmesan and a drizzle of extra virgin olive oil.