Spelled, millet, quinoa, teff, freekeh, kamut or amaranth: the choice is large if you want to put an alternative grain on the table. You can do a surprising amount with them and they are healthy too.
Usually these are unprocessed whole grains and they are naturally rich in fiber, proteins, vitamins and minerals. They are often referred to as superfoods for a reason. It is healthy to vary this on potatoes, rice and pasta, because it makes it easier for you to get all the different nutrients you need.