What Are Injera Ingredients?

Injera is the national dish of Ethiopia, but do you know what are injera ingredients?
 
Traditionally, injera has only two ingredients, teff and water. But because it is expensive, some people replace teff with other grains.
 

How to make injera?
Prepare these ingredients:
1. teff flour
2. all-purpose flour
3. Salt
4. lukewarm water
 
Steps to Make It:
1. In a large mixing bowl, combine the flour and salt until well mixed. Then add the water, stirring until combined.
2. Cover loosely with a paper towel and let stand, undisturbed overnight.
3. Gently agitate the mixture with a spoon in the next day (if there are  bubbles already forming on the surface). Cover again and let stand at room temperature, undisturbed overnight. Repeat this cycle once more.
4. After 3-4 days, your injera should smell sour and be very bubbly, stir the mixture until combined.
5. Heat a large, lightly-oiled heavy-bottomed skillet over medium-high heat. Add about 1/3 cup of the batter to the skillet, forming a thin layer of batter over the pan. Cook until bubbles form on the entire surface of the injera.
6. Using a spatula, remove the injera and transfer to a plate. the injera is finished.
 
However, due to different eating habits in different regions, there are also differences in ingredients and making methods. What is the injera ingredients in your country?