If I had to guess, I would not get it right. Greg grew some this year and the first time I saw it, I asked “what is it??”. It is a Kohlrabi. See full description here on Wikipedia. To me, they taste like a mild radish, actually very tasty. They can be cooked too, although I am not sure how. These would be good in a salad raw. Guess I will have to experiment with cooking some as well.