Peel and finely chop the ginger. Peel onion and cut into cubes. Clean and wash the kohlrabi and chop the small leaves. Cut about 100 g kohlrabi into curls with a peeler. Dice remaining kohlrabi. Heat the fat in a pot and fry the onions and ginger until translucent. Add the diced kohlrabi, pour on the stock and bring to the boil.
Cover and cook for 15-20 minutes. Wash the coriander greens, dab dry and chop coarsely except for a little to garnish. Add cream, coriander and kohlrabi greens to the soup and puree everything finely with a chopping stick. Season to taste with salt and pepper and heat the kohlrabi curls in the hot soup for about 1 minute. Arrange in deep bowls and sprinkle with radish sprouts. Garnish with coriander leaves and serve with a pastry stick