Coarsely chop the pointed cabbage and cook in salted water for 5 minutes. Halve the mushrooms.
Cut parsnips into pieces and fry in vegetable oil. Add the juice of half an orange, thyme, pepper and salt, deglaze with the vegetable stock and cook for 15 minutes. Add the pointed cabbage, mushrooms and sour cream, season to taste again and cook for another 5 minutes.