Brussels sprouts are a leafy green vegetable that grows in small, compact heads, that look like mini cabbages. Purple Brussels sprouts are slightly sweeter and not quite as pungent as green Brussels sprouts. The purple color comes from the pigment anthocyanin, which acts as an antioxidant (blueberries are another source of anthocyanin). They also keep their beautiful purple color when cooked. Get the recipe for roasted Brussels sprouts here.