Peel the kohlrabi and cut into large cubes. Put the cabbage in a saucepan and fill it with the vegetable stock until the cabbage is just below it (if too little, it is better to add a sip of hot water later as soon as it is pureed).
In the meantime, peel and grate half the carrot. Wash and chop the parsley and chives and mix with the carrots in a bowl.
As soon as the kohlrabi is soft, puree with a blender. Stir in the crème légère and season with the spices. Add carrot and herb mix, fold in and serve.