The Jerusalem artichoke is a once-forgotten vegetable that is making a comeback. Native of North America, it was named Jerusalem artichoke because of its unique taste that is similar to the artichoke. It is mainly available in the fall, but it keeps well for three to four months when stored in a perforated plastic bag in the refrigerator. You can prepare it in dishes as you would potatoes, in gratins and soups. Its flesh blackens quickly when exposed to air, so place in a bowl of lemon water after peeling.