sunflower tuber eaten raw or boiled or sliced thin and fried as Saratoga chips

an underground vegetable like a cross between a rutabaga, potato, sunflower seed, and water chestnut

This vegetable is a member of the sunflower family i s also known as a "sunchoke" and has a flesh that is nutty, sweet, and crunchy. Also called "Jerusalem artichoke," although it is not an artichoke.