It looks like an alien vegetable doesn’t it? I got purple, but you might get green. The inside of both are the same, white.
Kohlrabi is a brassica, the bulb protion tastes sort of like the peeled stem of broccoli to me. Or like a very mild sweet radish. It is crisp and tender. The leaves are delicious raw if they are small and young. You can saute or juice the greens. Just treat them like any leafy green.
You need to peel the tough outer skin of the kohlrabi bulb for any prep.
Now you can slice this up and stir fry it, or roast it. I like kohlrabi raw, in salads or slaw, or just sliced with some lime juice and salt.