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Heat the oil in a large saucepan, then gently fry the onion and garlic for 5 mins or until soft. Add the potato, stock and 500ml water, then simmer for 7 mins until the potato is just cooked.
Scatter in the peas and watercress, stir, cover, then simmer for 3 mins. Add the mint leaves and blitz with a hand blender until smooth. Stir in the cream and season to taste. Serve ladled into bowls, scattered with more mint and some cracked black pepper.
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