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Fermented milk from Ethiopia
Ergo is Ethiopia's everyday sour milk. Raw cow milk is left in a smoked clay pot or gourd for one to three days until it sets into a thick, sour curd. It is eaten as it is or churned into butter (kibe) and buttermilk (arera).
| Raw cow milk | Fermented spontaneously or by back-slopping[karssa2024] |
| Smoke from Olea africana wood | Used to smoke the vessel before filling[diriba2023] |
| Fresh rue leaves (Ruta chalepensis) | Optional flavouring. Rue is a toxic plant and must be avoided in pregnancy; see the safety note[fao-tmp-ii][ipcs-rue] |
| Starter | spontaneous | backslop |
Total time across the recorded steps: 24 h – 3 days
What changes: Burning Olea wood smokes the inside of the clay pot or gourd
Output: smoked vessel.
Microbes at work in this step
FAO says the containers are smoked beforehand to avoid mould growth
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
Ergo is Ethiopia's everyday sour milk. Raw cow milk is left in a smoked clay pot or gourd for one to three days until it sets into a thick, sour curd. It is eaten as it is or churned into butter (kibe) and buttermilk (arera). Made in 4 steps over 24 h – 3 days. The longest step, leave raw milk to sour, takes 24 h – 3 days (Karssa T.H 2024) and runs at 16–18 °C (Karssa T.H 2024). Lactococcus garvieae, Lactococcus lactis subsp. lactis, Lactobacillus, Streptococcus and Leuconostoc does most of the fermenting.
| Main step | 24 h – 3 daysReported[karssa2024][afr26] | Leave raw milk to sour |
|---|---|---|
| Temperature | 16–18 °CReported[karssa2024] | Leave raw milk to sour |
| Acidity | pH 3.5Measured[tsegaye2005] | Leave raw milk to sour |
Ergo is soured in a vessel smoked with Olea africana wood, which slows moulds. It is also the starting point for Ethiopian butter, buttermilk and ayib cheese.
Ergo is made from raw milk. In challenge studies E. coli O157:H7 grew while the milk soured, and Listeria monocytogenes grew for 12 h before dying off; container smoking sped up its inactivation. Souring does not make it safe. A review of Ethiopian fermented milks says E. coli O157:H7 survives milk fermentation and has been found in ergo, and names heat treatment of the milk as a control. Rue is a toxic plant. The WHO poison monograph on common rue, which also names Ruta chalepensis as toxic, lists vomiting, liver and kidney damage, and uterine bleeding and abortion in pregnancy.
Hazards the sources name: Escherichia coli O157:H7 (grew in souring milk and survived in a challenge study); Listeria monocytogenes (grew for the first 12 h of souring in a challenge study).
Every number is labelled with how it is known. How this atlas is made
