Peel and core the tomatoes and dice the tomato flesh. Cut the onions into fine rings. Wash the leek and cut into fine rings. Core the peppers and cut into strips.
Sauté the onions with the leek and paprika in the oil. Season the vegetables with salt, pepper and paprika powder. Add tomato paste, deglaze with meat stock and simmer for another 5 minutes. Roughly dice the fish fillet and add to the vegetables with the tomatoes. Fold in the sour cream and simmer openly for another 5-10 minutes. Now add herbs to taste.