For many of us, Thanksgiving means turkey and cranberry sauce. If you’re in Eastham, you’d better add turnips to your list. But it’s not just ANY turnip we’re talking about here — it has to be an EASTHAM TURNIP. “It was always the star accompaniment to our Thanksgiving turkey,” the late Don Sparrow wrote in his book, A Cape Cod Native Returns. “The rutabaga or yellow turnip had no place on our holiday table; we had to serve the white, Eastham variety.” For those wishing to in