Parsnips are unfamiliar to a lot of people, but they look like big white carrots and taste like a cross between a carrot and a potato. That is, good.
Peel, slice into sticks, coat with a little olive oil, and roast at 400 until done, maybe 15-20 minutes. These are excellent mixed with regular potato or sweet potato fries, or even by themselves. Serve with a Sriracha aioli (1/2 mayo, 1/2 Sriracha, mixed).