Knowledge Base

Injera

Grain ferment · Traditional · peer-reviewed

Ethiopia and Eritrea's spongy sourdough flatbread — teff batter fermented by wild yeast and LAB until sour, then poured into a lace-holed crepe.

Moderate to make
2–4 days ferment
live-cultures, lactic-acid, fiber supplied

Ingredients

  • Teff flour (or teff blended with other flour)500 g
  • Water, non-chlorinated750 ml
  • Optional: a spoon of previous batter as starter2 tbsp

How to make it

  1. Step 1

    Whisk teff flour with water into a smooth, pourable batter. Add a spoon of old batter if you have it.

  2. Step 2

    Cover loosely and leave at 20–25 °C.

  3. Step 3

    Ferment 2–3 days, stirring once a day, until bubbly, sour, and slightly risen.

  4. Step 4

    Batter should smell tangy-yeasty and show active bubbles. Thin with a little water if too thick to pour.

  5. Step 5

    Pour onto a hot, lightly oiled clay mitad or non-stick pan. Cover to steam; cook until surface is set with eyes (holes), no need to flip.

  6. Step 6

    Cool, stack, and keep wrapped. Refrigerate extras; the batter can seed the next ferment.

What it is

Injera is the spongy, sour flatbread central to Ethiopian and Eritrean meals. A batter of teff (Eragrostis tef) flour and water is left to ferment for two to three days, then poured onto a hot griddle where it sets into a soft crepe riddled with "eyes" — the holes that soak up stews (wot). It is a wild sourdough: no commercial yeast required, though a spoon of previous batter speeds and steadies the culture.

The science

Teff batter ferments as a yeast–LAB consortium, much like wheat sourdough but adapted to teff's composition. Studies of traditional injera report lactic-acid bacteria (including Lactobacillus and Leuconostoc species) alongside yeasts that generate CO₂ for the characteristic eyes; the bacteria produce lactic and acetic acids that drop the pH and create the sour flavour (Gashe, 1985; Baye, 2014). Fermentation also reduces phytate and can improve mineral bioavailability in the finished bread — one reason teff injera is valued beyond its taste.

Temperature and time are the controls: warmer rooms acidify faster; a 48–72 h window at room temperature is typical for a balanced sour.

Safety

Use clean vessels and non-chlorinated water. A healthy batter smells cleanly sour and yeasty. Discard if you see fuzzy coloured mould, pink/orange streaks, or a putrid smell. Cook the batter fully on the griddle before eating — injera is a cooked bread, not a raw batter food.

Signs it worked / troubleshooting

  • ✅ Good: bubbly batter in 2–3 days, pleasant sour smell, cooked injera full of eyes.
  • ⚠️ Flat, few eyes = under-fermented or pan too cool → give the batter another day, cook hotter and covered.
  • 🚫 Mould or off smell = contamination → discard and start fresh.

How to store

Cooked injera keeps a few days wrapped at room temperature in a cool kitchen, or longer refrigerated. Save a spoon of fermented batter in the fridge to inoculate the next batch.

References

  • Gashe BA (1985). Involvement of lactic acid bacteria in the fermentation of tef (Eragrostis tef), an Ethiopian fermented food. Journal of Food Science 50(3):800–801. doi:10.1111/j.1365-2621.1985.tb13799.x
  • Baye K (2014). Teff: nutrient composition and health benefits. Ethiopia Strategy Support Program Working Paper 67. IFPRI.
  • Stewart RB, Getachew A (1962). Investigations of the nature of injera. Economic Botany 16(2):127–130. doi:10.1007/BF02985301

Related

LevainYogurt