That is a kohlrabi. I had no idea what it was or what to do with it, but I was determined to not let it go to waste. After googling some options, I decided on a kohlrabi apple slaw. I used this recipe from Shiny Cooking.
Here is what you need to make it.
I made two modifications to this recipe. It is supposed to be equal parts kohlrabi and apple, but I was really nervous about it, so I doubled the apples. I also switched out greek yogurt for plain yogurt.
The final product:
The verdict is it is actually really good. Charles really liked it too. Kohlrabi is a lot like jicama, not a lot of flavor, but a good crunchy texture. If I make it again, I will definitely keep the changes I made.