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Boil the potatoes for 15 mins or until tender. When the potatoes have 5 mins cooking time left, tip the beans into the boiling water. Drain and cool under cold running water.
Meanwhile, finely slice the shallots or onion. Place in a bowl and sprinkle with the vinegar and oil then leave for 5 mins. Toss potatoes and beans in with the shallots and sprinkle with the mint.