Place the potato sticks in cold, salted water and bring to the boil. After 3 minutes add the kohlrabi sticks. Then cook both for about 10 - 15 minutes (prick with a fork and try whether it is done). Pour 2/3 of the whole thing (that means approx. 1/3 remains in the pot) and collect a small amount of stock in a cup.
Stir the butter, herb cream cheese and cream into the remaining mixture over low heat. Allow to melt and stir in the kohlrabi green. If the mixture is too thick - add a little more of the drained water. Season to taste with freshly grated nutmeg, possibly with salt and pepper.
A good Saarland Chili-Lyoner tastes good with it, but probably also meatloaf, meatballs, bratwurst, pork chops and much more.