A gluten-free grain, millet is loaded with antioxidants and high in magnesium, a mineral that maintains muscle and nerve function. There are four types of millet: pearl, foxtail, proso and finger. In India, finger millet is most commonly used to make roti, a flatbread staple. In Africa, millet is typically eaten as a porridge. Millet can be ground into flour and, because of its mild taste, can be combined easily with other flours in baking applications.