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Kunu-zaki is a sweet, mildly sour Nigerian millet drink. Dehulled millet is steeped, which starts a brief fermentation, then wet-milled with ginger, cloves and pepper, sieved and partly gelatinised by mixing a boiled slurry with a cold one. It is sweetened and drunk fresh, still fermenting.
Fully documentedSoft drinks16 h – 3 days
Recipe
Amounts from a sourceA lab batch that followed the traditional process (Ezekiel et al. 2018, a millet-sorghum formulation with ginger and cloves); household recipes vary in grain and spice.
Total time across the recorded steps: 16 h – 3 days
Start
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What changes:Millet soaks while lactic bacteria and yeasts grow
Step 1 of 5
Steep the dehulled millet
Time
8 h – 2 days
Reported
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Lactic acid bacteria
Yeasts
Moulds
Lactobacilli
Output: steeped grain.
Flavour
Not documented
Texture
Not documented
Colour
Not documented
Microbes at work in this step
lactic acid bacteria and yeasts grow in a brief fermentation during the steep; moulds are eliminated
Method
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
At a glance
Kunu-zaki is a sweet, mildly sour Nigerian millet drink. Dehulled millet is steeped, which starts a brief fermentation, then wet-milled with ginger, cloves and pepper, sieved and partly gelatinised by mixing a boiled slurry with a cold one. It is sweetened and drunk fresh, still fermenting. Made in 5 steps over 16 h – 3 days. The longest step, steep the dehulled millet, takes 8 h – 2 days (Haard N.F. et al. 1999). Lactiplantibacillus plantarum and Weissella confusa do most of the fermenting.
Kunu-zaki is only partly gelatinised, by mixing a boiled slurry with a cold one, and it is drunk while still actively fermenting rather than cooked into a porridge.
Untreated kunu-zaki keeps only about a day at ambient temperature; pasteurising at 60 °C for 1 h and refrigerating extends it to about 8 days. Drinks from three producers near Zaria, held for sale at ambient temperature, carried coliforms, B. cereus and S. aureus at under 10^4 per mL. The authors call the counts apparently safe but the contaminated setting and ambient holding risky. Processing cut mycotoxins in maize-based kunu-zaki by 76.2–99.9 % in one study. Its grain inputs held up to 31,200 µg/kg and the drink up to 123 µg/kg. A lab study of millet-sorghum kunu says its safety on mycotoxins depends on the grain used (Ezekiel 2018).
Hazards the sources name: Coliforms, Bacillus cereus and Staphylococcus aureus (below 10^4 per mL in kunun-zaki from three producers).
The traditional process was described by Adeyemi and Umar in 1994, as cited in FAO's 1999 survey of fermented cereals. FAO reported the drink as widely drunk in northern Nigeria and becoming more common in southern Nigeria for its refreshing quality, and that the Federal Institute of Industrial Research Oshodi (FIIRO) in Lagos had kept it for 90 days with chemical preservatives.