Mix flour and water until smooth. Cover with towel and let set at room temperature for 1-3 days. The mixture should begin to ferment and let a slightly sour smell. You can tell that it is ready when a thick film accumulates on top. It will bubble and look almost brain-like. Skim off and dispose of the dark mold spots. Lightly whisk the batter-it should have the consistency of a thin pancake mix.
Cook the batter in a non-stick skillet over medium-high heat. Once bubbles form on top of the bread, cover with a lid and let it steam for roughly one minute.
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Teff flour is a gluten-free, high-protein flour made from the grains of teff grass, a native Ethiopian grain. Look for it in specialty markets or order it online. Bob's Red Mill makes a nice variety.