Purple cauliflower is identical to white cauliflower, except for its color, and is also a member of the very large family of brassica. Its color comes from anthocyanin, a flavanoid packed with antioxidants. An excellent source of vitamin C, cauliflower contains folate, potassium and dietary fiber. Purple varieties provide some vitamin A. Low in calories and sodium, three florets contain about 13 calories. Enjoy purple cauliflower raw or steam it to protect its color, which is loved for its vivid presentation as well as its good taste and nourishment.