There are many different kinds of cabbage. Red cabbage also known as purple cabbage is similar to the green varieties but it is much higher in vitamin C, vitamin A and twice as much iron as green cabbage. It's high in fibre and a good source of potassium, the red colour is a bonus, it can help you with achieving your rainbow of daily vegetables (when cooked it turns more blue, adding a little vinegar will help keep it's deeper red colour).