Instructions: 1 Marinade the herrings the day before: peel the onions, wash them and cut into rings. Place layers of herring fillets and onions in a small dish, pour in oil to cover them - make sure the level of oil is well above the herrings so that they do not dry out.

2 The following day, wash the potatoes and cook them in salted water, leaving the skins on.

3 Prepare a vinaigrette: put the vinegar, salt, pepper and oil in a large bowl and mix together well.

4 When the potatoes are cooked, strain, then peel them. Cut into rings.

Pour the vinaigrette over and toss gently, so as not to break up the potatoes.

5 Serve the potatoes as a salad with the marinated herrings.

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