Put the chopped onion into a bowl. Sprinkle over a good pinch each of salt and sugar and a grinding of pepper. Toss well and leave for 10 minutes to soften. If the onion releases a lot of liquid, drain it off.
Sprinkle over the cider vinegar and chopped dill, stir and then leave to stand for another 10 minutes. Fold in the potatoes and the soured cream, check the seasoning (it may well need a bit more salt) and serve.
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