Wash the Bismarck herrings, pat dry and dice them into small cubes.
Cut the onion into cubes and mix with the herrings.
Dice the beetroot and mix with the herrings
Peel, core and dice the tart apple and mix with the herrings. Finely chop the capers and mix in. Finely chop the eggs and mix in.
Also cut the pickles into fine cubes and fold them into the salad.
Mix together mayonnaise, beetroot juice and white wine vinegar and season with salt and pepper. Mix the sauce well with the herring salad and let it steep in the refrigerator for at least two to three hours.