Jerusalem artichoke also known as sunchoke,  sunroot , topinambour, or  girasole.  They are a close relative to the sunflower. The root is the edible part of the plant.  One cup sliced = 5 ounces. These look like small, knobby potatoes, and have a crisp texture and an interesting earthy flavor. You can eat them raw, stir-fry them, or bake them like potatoes. It's best not to peel them, and you should dunk them in acidulated water after slicing them to keep them from discoloring.