The cardoon is a relative of the artichoke without its edible flower, but grows like celery, only much taller. Cardoons are available in Italian and specialty grocery stores.
Discard tough outer stalks of the cardoon. Break off the tender, inside ones. With a potato peeler, peel the ribs, or strings, off the stalks, just like peeling celery.
Cardoons turn dark (like artichokes) when cut; to prevent this, rub the cut side of a lemon over the branches as soon as they are peeled. Cut into 2-inch lengths and put into water to which ha