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Alcoholic drinks from Rwanda, Burundi, Uganda, Tanzania, DR Congo, Kenya
Beer bananas are ripened in a warm pit lined and covered with banana leaves, peeled and kneaded with spear grass to press out the juice. The juice is diluted, mixed with roasted, crushed sorghum and left in a warm pit for a few days, where wild yeasts and lactic bacteria turn it into a cloudy, sweet-sour beer. Made in 4 steps over 2 days – 6 days. The longest step, dilute the juice, add sorghum and ferment in a warm pit, takes 2–6 days (Shale K 2014) and runs at 25 °C (Munezero E 2018). Saccharomyces cerevisiae and Schizosaccharomyces pombe and Lactobacillus plantarum and Leuconostoc mesenteroides do most of the fermenting.
| Main step | 2–6 daysReported[shale2014][munezero2018] | Dilute the juice, add sorghum and ferment in a warm pit |
|---|---|---|
| Temperature | 25 °CMeasured[munezero2018] | Dilute the juice, add sorghum and ferment in a warm pit |
| Acidity | pH 4–4.7Measured[munezero2018] | Dilute the juice, add sorghum and ferment in a warm pit |
| Ripe beer bananas · Ripened in a warm, covered pit[shale2014] | |
| Water · Added to the juice in the proportion the brewer wants[shale2014] | |
| 5 % (the level the study recommends) | Coarsely ground grilled sorghum · Levels of 0–15 % were tested[munezero2018] |
| Spear grass · Used to knead the juice out and to filter it[shale2014] | |
| Starter | spontaneous (yeasts and bacteria from the bananas, sorghum and vessels) |
Total time across the recorded steps: 2 days – 6 days
What changes: Green bananas ripen and soften in a warm pit under banana leaves
Output: ripe bananas.
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
Banana beer is made from fruit juice, not from a grain mash. The sorghum is roasted rather than malted and is only a small addition that feeds and speeds the ferment.
A review of urwagwa names the risks. Coliforms such as E. coli can come in with the water, Staphylococcus from brewers' hands, and mycotoxins from mouldy sorghum. Clean water, clean hands and sound grain reduce them.
Hazards the sources name: Escherichia coli and other coliforms from water and hands, reported in East African traditional beers; Staphylococcus aureus from handlers' skin; Mycotoxin-forming moulds on sorghum (Fusarium, Penicillium, Aspergillus).
Every number is labelled with how it is known. How this atlas is made
Rubisi in Tanzania has records from about 300 years ago, and 19th-century travellers described banana beer being made in the Kagera region and in west-central Uganda. Bananas came to East Africa from Southeast Asia, and East Africa became a secondary centre of banana diversity. In Rwanda, banana beer is offered to guests, given in dowries and served at weddings, funerals and births.
