Red cabbage. also known as purple cabbage. is a crisp and flavourful vegetable that adds a delicious crunch and a pop of nutrition to culinary creations. With its rich. deep red-to-purple hue. red cabbage stands in dishes. adding both visual appeal and a subtle sweetness. Red cabbage is part of the cruciferous family of vegetables and contains phytochemicals and antioxidant vitamins. It is high in vitamin C and vitamin K. With local availability from late-July to early-January. red cabbage can be served as a side dish. in soups. in salads or as the star of a main dish.