Clean the kohlrabi and cut into fine sticks. Heat water in a saucepan and add the broth. Add the kohlrabi and let cook for about 10 minutes.
Drain the kohlrabi and collect about 250 ml of the stock.
Melt the butter, dust with flour, sweat and fill up with 250ml of the stock. Add the lemon juice, the cream and the kohlrabi sticks and season with salt, pepper and nutmeg. Garnish with chopped parsley.