Russian cuisine: Marinated Fish Russian Style

Clean the fish, salt it and fry on both sides until ready. Then cook the marinade: slice the vegetables, add pureed tomatoes and fry on slow fire until it is all tomato red. Then add water, make the mixture boil, add salt, vinegar and spice and cook for 15 more minutes. Pour the marinade over the fish and set aside for at least 5 hours.