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If the potatoes are larger than mouthful sized, cut them into smaller chunks. Boil in salted water for about 15 mins, until just done. Meanwhile, halve the red onion, then slice it as thin as you can.
Whisk the vinegar and honey with 1 tsp salt until the salt dissolves, then whisk in the olive oil. Drain the potatoes, mix with the dressing, onion and capers. Leave to cool. Serve at room temperature.