Clean the fish, acidify, season with salt and cut into bite-sized pieces, finely dice the onion. Peel the potatoes and cut into cubes. Heat the oil in a saucepan, steam the onions and potatoes, sprinkle with paprika powder and fill up with a little water. Let simmer for a good 10 minutes. Add tomato paste, pickles, capers. Put the pieces of fish in the pot and cook for another 10 minutes. Now season everything with the herbs and spices. Mix the cream with a spoon of hot fish soup and add to the soup.