This vegetable is also known as "knot celery" and "turnip-rooted celery." The roots, which are about the size of a white turnip, and not the stalks are eaten. They are more often used as a vegetable than as a salad.
Pare the celeriac, cut in thin, narrow slices, and put into cold water. Drain from this water and drop into boiling water and boil thirty minutes. Drain and rinse with cold water. The celeriac is now ready to be prepared and served the same as celery.