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Roots and tubers from Southern and south-western Ethiopia
The inner leaf sheaths and corm of the enset plant are scraped to a pulp, mixed with an old ferment as starter and packed into a leaf-lined pit or basket. Over weeks to months lactic bacteria sour it into kocho, a dense, sour staple for millions in southern Ethiopia.
| Scraped inner leaf sheaths of the enset pseudostem | [andeta2018][tadesse2024] |
| Grated or decorticated enset corm | [tadesse2024] |
| Starter (gamma or gamancho) | Previously fermented enset, or fine-cut pseudostem with herbs, tree leaves and rotted leaf sheaths left 15–30 days[tadesse2024] |
| Starter | backslop: gamma or gamancho, an earlier ferment of enset with herbs and leaves |
Total time across the recorded steps: 2 days – 12 months
What changes: Enset leaf sheaths are scraped to pulp and the corm is grated
Scraping the pseudostem and fermenting it in a pit or a bamboo basket were the two steps every Gamo highland maker shared. Output: enset pulp and fibre.
Microbes at work in this step
Not documented for this step.
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
The inner leaf sheaths and corm of the enset plant are scraped to a pulp, mixed with an old ferment as starter and packed into a leaf-lined pit or basket. Over weeks to months lactic bacteria sour it into kocho, a dense, sour staple for millions in southern Ethiopia. Made in 5 steps over 2 days – 12 months. The longest step, pack into a leaf-lined pit or basket and cover, takes 2 days – 12 months (Andeta A.F 2018). Leuconostoc mesenteroides starts the fermentation; Leuconostoc and Lactococcus lead early and Later: Prevotella paludivivens, Lactobacillus, Weissella and Bifidobacterium minimum do most of the fermenting.
| Main step | 2 days – 12 monthsReported[andeta2018][tadesse2024][birmeta2019] | Pack into a leaf-lined pit or basket and cover |
|---|---|---|
| Acidity | pH 7.2 → 4.15Measured[tadesse2024] | Pack into a leaf-lined pit or basket and cover |
Kocho is not made from a root or grain but from the pulp of a banana-like plant's stem and corm, and it can stay in the pit for months to a year.
Kocho soured to pH 4.3 held back Salmonella, Bacillus cereus and Staphylococcus aureus added to it. Acid does not remove spores. In a study of long-term kocho (7 months to a year), 3 of 10 bacterial isolates were identified as Bacillus anthracis, the anthrax bacterium, and 1 as B. thuringiensis, both in the B. cereus group. The authors call this a critical finding, because spores may survive low pH and may come from the soil pit, poor hygiene or manure. They ask for stricter sanitation and starter cultures. The names rest on 16S rDNA sequences, and the paper reports no test for the virulence plasmids that the authors say toxicity depends on. They also say human infection mainly comes from contact with infected animals. They know of no illness reported from kocho and suggest low bacterial numbers and inactivation in baking as possible reasons, but the paper tested neither. Do not eat it uncooked, though no source we read shows that cooking kills these spores.
Hazards the sources name: Bacillus anthracis (3 of 10 isolates) and B. thuringiensis (1 of 10), both in the Bacillus cereus group, in long-term kocho.
Every number is labelled with how it is known. How this atlas is made
