cardoon = cardoni = cardi = Texas celery = chardoon    Pronunciation:  kar-DOON  Notes:  This vegetable is very likely an early ancester of the artichoke. Its large, grayish-green stalks are somewhat bitter, but they remain popular in Italy and North Africa.   You can find them in large produce markets in late fall.   Substitutes:  artichoke hearts OR celery (not as bitter) OR salsify