Organic Kavuni Red,Black Rice. Kavuni rice is a rare rice variety, which is very good for health. It contains anthocyanin which is a good antioxidant. Found in dark blue, red and purple foods, anthocyanin antioxidants show promise for fighting heart disease, cancer, and other diseases. This can be cooked after soaking in water for 30 minutes. Then sugar or jaggery along with coconut is added with the cooked black rice and can be eaten.