"Greens are a direct part of African-Amercans' African heritage. Dishes using leafy greens abound in the cooking of the African Atlantic world. They turn up as a couve in Brazil, as a callaloo in the Caribbean, as sauce feuilles in French-speaking West Africa, and simply as greens in the southern United States. The African-American twist with greens is in the manner of cooking. We cook 'em long and slow ?down to the proverbial "low gravy"? (but then again that was the way all vegetables were cooked in much of the past). The real innovation is in the eating: We savor not only the greens but also their cooking liquid or "pot likker," a rich source of vitamins and iron...."