Pat the fish fillet dry and pepper. Use the spiral cutter to cut the zucchini and carrots into a spaghetti shape. If a spiral cutter is not available, it is also possible to cut into very fine pencils. Kohlrabi or other beets can also be used. Then process it separately. Treat the beetroot separately and cut into spaghetti shape.
In a separate non-stick pan, heat half of the butter with half of the oil, season with pepper and salt. Add the beetroot and stir-fry at medium temperature. Season again. Deglaze with 50-100 ml of white wine again and again and cover and let simmer for about 10-15 minutes. There shouldn`t be any sauce left at the end. If necessary, let the wine evaporate without the lid. Season to taste before serving.
Turn up the beetroot spaghetti and arrange in a pile on plates. Add the zucchini and carrot spaghetti. Arrange the fish fillet and add the sauce with the tomatoes in between.