1.In a medium heatproof bowl, combine onion and cucumber.
2.In small saucepan, combine vinegar, sugar and salt. Stir over low heat, without boiling, until sugar is dissolved. Bring to the boil; pour over onion mixture, cool.
3.Meanwhile, boil, steam or microwave potato until tender; drain. Place potato in large bowl. Add onion mixture, oil, dill and capers. Season to taste. Toss gently; serve warm.
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