Wash the potatoes and cook in salted water for about 20 minutes. In the meantime, sprinkle fish with lemon juice, season with salt and cut into pieces. Wash, clean and slice the zucchini and tomatoes. Peel and chop the onion and fry it in 1 teaspoon of oil. Add fish and vegetables. Season with salt and pepper and continue steaming for 6-8 minutes. Take out the fish.
Refine vegetables with tomato paste and sour cream. Add fish again. Drain potatoes, cut in half lengthwise and fry in the remaining oil until brown. Add coriander and fry briefly. Arrange fish ragout and potatoes, covered with roasted coriander, on a plate. Sprinkle with chopped dill