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Boil potatoes in salted water for 8 mins until just tender, then drain and keep warm (they will absorb the dressing better than cold potatoes). Meanwhile, steam the beans in a steamer over the potatoes for 4 mins. Keep a close eye on them as you want them to be just tender rather than soft. Cool the beans under the cold tap to keep their colour.
Mix the dressing ingredients in a bowl. Add the warm potatoes and beans, and toss really well to coat in the dressing. (Warm potatoes absorb the dressing better than cold ones.)