Steam the potatoes and while still warm, peel and slice them.
Heat the onion in a small pan with the vinegar. Leave it to reduce for a few minutes. Take off the heat, add
Wash the radishes well, slice them thinly and mix with the remaining tablespoon of oil and the juice of a lemon. On a large plate, pile the potatoes in a pyramid in the centre and surround them with the radishes. Strew the salad with chives and parsley.
In World War I a ‘potato-masher’ was a slang term for a German hand-grenade that was thus shaped.
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