Injera Sourdough Starter Refresh Ratio

1

Active teff starter (ersho) — Established culture at peak activity, smells tangy and mildly sour

1

Whole teff flour — Brown or ivory teff; stone-ground for richer flavor and better fermentation substrate

1

Lukewarm water — 30–35 °C (86–95 °F); chlorinated tap water should be left to stand 30 minutes

Discard all but 50–80 g of active starter. Stir in equal weights of teff flour and water (e.g., 80 g each). Mix vigorously to aerate. Cover loosely and ferment at 26–30 °C for 24–48 hours. At peak activity, the starter doubles in volume, smells tangy, and passes the float test. Use immediately or refrigerate and refresh again 24 hours before baking.

• Teff is gluten-free; without gluten network you cannot trap gas in a dough structure — full leavening happens in the liquid batter during the final 8–12 hour ferment before cooking
• Optimal fermentation temperature is 28 °C (82 °F); at cooler temperatures (below 20 °C) sourness deepens but timing stretches to 3–4 days
• A healthy ersho smells distinctly sour-fruity, never like acetone or cheese; acetone off-notes indicate over-fermentation — discard more aggressively on the next refresh
• The final injera batter is typically 1 part starter to 2–3 parts additional teff flour and water, fermented 8–72 hours more for full sour development
• When establishing a new starter from scratch, mix teff flour and water 1:1, leave uncovered for 24 hours to capture wild yeast, then refresh daily for 5–7 days until reliably active

• Barley or wheat flour blend

  Some households substitute up to 50% all-purpose or barley flour for milder sourness; fermentation completes faster at 20–24 hours

• Cold retard

  After peak activity, refrigerate at 4 °C for up to 1 week; refresh 24–48 hours before using to restore vigor

• Accelerated with leftover injera

  Crumbled day-old injera blended with water can replace part of the flour to seed more wild yeast and speed early-batch establishment

• High hydration (1:1:1.5)

  More water produces a looser starter with faster acid development; batter becomes more pourable and injera thinner

• Injera Batter Ratio

  The starter feeds into the batter at roughly 1 part starter to 2–3 parts flour and water

• Sourdough Bread Starter (1:1:1)

  Identical feeding formula applied to wheat flour; the underlying microbiology is directly analogous

• Levain Build Ratio

  Scaling a starter into a larger levain before baking follows the same weight-based logic

1. 1.Teff Love — Kittee Berns (2016)
2. 2.On Food and Cooking — Harold McGee (2004)
3. 3.The Art of Fermentation — Sandor Ellix Katz (2012)
4. 4.Ethiopia: Recipes and Traditions from the Horn of Africa — Yohanis Gebreyesus (2017)

Confidence: high