Peel, wash and chop the potatoes. Cover and cook in salted water for about 20 minutes.
Peel and chop the onion. Fry in 1 tbsp. hot oil. Mash juniper, add sauerkraut and bay leaf and fry. Add 3/8 l water. Bring to the boil, cover and stew for about 15 minutes.
Roast the nuts in a pan without fat, remove. Wash the fish, dab dry and cut into 8 pieces. Salt fish, turn in flour and tap. Fry in 1 tablespoon of hot oil in a coated pan for 2-3 minutes on each side.
Wash and finely chop the parsley.
Drain the potatoes and collect the cooking water. Add approx. 150 ml of it and sour cream to the potatoes and mash finely. Season the puree with salt and nutmeg. Fold in nut flakes.
Season the sauerkraut with salt, pepper, verjus and 1 teaspoon sugar. Serve with purée and fish. If necessary, toss the prawns briefly in the fish frying fat and spread on top. Season with pepper. Sprinkle with parsley.