Wash the potatoes. Cook in boiling salted water for about 20 minutes. Then rinse with cold water, peel and leave to rest for a while. In the meantime peel, wash and slice the carrots. Clean, wash and cut celery into thin pieces. Cook carrots and celery in boiling salted water for 5 minutes.
Then drain. Cut potatoes into slices and mix with carrots and celery. Peel and finely chop the onion. Bring vinegar and diced onion to the boil briefly. Season with salt, pepper and sugar. Pour 2 tablespoons of oil over the salad. Cover and leave to stand for approx. 30 minutes. Then season again. In the meantime wash the fish. Turn one after the other in flour, whisked egg and parmesan. Heat the rest of the oil.
Pour 2 tablespoons of oil over the salad. Cover and leave to stand for approx. 30 minutes. Then season again. In the meantime wash the fish. Turn one after the other in flour, whisked egg and parmesan. Heat the rest of the oil. Fry the fish pieces at medium heat for about 10 minutes while turning. Season with salt and lemon juice. For the dip, wash and chop the parsley. Mix with yoghurt and season to taste with salt and pepper. Serve everything garnished with parsley and lemon
Fry the fish pieces at medium heat for about 10 minutes while turning. Season with salt and lemon juice. For the dip, wash and chop the parsley. Mix with yoghurt and season to taste with salt and pepper. Serve everything garnished with parsley and lemon