Place teff & 2 c water in medium covered saucepan. Bring to a boil, lower heat & simmer until water is absorbed, about 15 minutes, stirring occasionally. Add onion, jalapeno, flour & rest of water to make a batter.
Oil a hot skillet with sesame oil. To make cakes, pour 1/4 c of teff batter onto skillet & cook till browned on both sides. Serve with heated groundnut sauce, see recipe.