Add a little adventure to everyday meals with teff, a tiny whole grain that has been a staple of traditional Ethiopian cooking for thousands of years. Whole Grain Teff (Tef, T'ef) an ancient North African cereal grass, is a nutritional powerhouse. It is the smallest grain in the world (about 100 grains are the size of a kernel of wheat!). The germ and bran, where the nutrients are concentrated, account for a larger volume of the seed compared to more familiar grains.