Since Kohlrabi is juicy, it is not easy to make it into crispy fries. Perhaps dusting with flour and deep frying at the right temperature can get it close to home fries. But, I suspect it will still remain a bit soggy.
Anyway, I wasn't going to deep fry. So, I oven baked these kohlrabi sticks. Not quite thin as shoestrings, but not quite chunky as wedges. Adjust the cooking time for the size of the cut kohlrabi.
With a mildly sweet flavor that is delicate, kohlrabi bulbs have quite the crunch when tender, almost like a crisp apple. I like to toss them in slaw and salads along with tart apples and baby red radishes.
The basic idea is not very different from roasting potatoes: Place in a roasting pan in a single layer, drizzle with oil or spray some oil, sprinkle salt, a dusting of brown sugar (for caramelization) and paprika. Bake in a 440°F oven for about 50 minutes depending on how thick-cut the "fries" are; flip halfway to brown all sides.
I let mine char a bit - I'd like to say 'on purpose' as burnt foods can bring out some delicious flavors if done right - but, sadly, I just ignored the timer's beep and let the fries sit in the oven too long after the oven was turned off.