They are available canned, in jars and frozen. Artichokes , related to thistles, are native to the Mediterranean and grown in other parts of the world. These large flower buds have a tightly packed cluster of tough, pointed, prickly leaves that conceal pale green inner leaves and a gray-green base, which together make up the heart.
Artichokes are also available frozen, canned, and marinated.
Trim the stem even with the base and cut away the fibrous, dark green layer around the base, being careful not to trim the rich meaty crown that lies beneath it. Cut in half lengthwise and use a small, sharp-edged spoon to remove the fuzzy choke. Remove any interior leaves that have prickly tips. To prevent the artichokes from discoloring, rub the cut surfaces with a lemon half and immerse the trimmed artichokes in a bowl of water containing lemon juice. Cover and steam until tender when pierced with a fork, 5-7 minutes.