FermenteaWhere food goes to change
Equipment · Gourds, calabashes and carved bowls
draining gourd
A gourd vessel used for fermenting Zambian mabisi; some Western Zambian forms have a low opening for draining whey.
Mabisi is Zambia's spontaneous fermented milk, and calabashes are one of the vessels used to make it. A survey across nine Zambian provinces recorded gourds alongside clay, plastic and metal containers. Later interviews in Southern, Eastern and Western provinces found that many participants remembered their forebears fermenting milk in calabashes. These accounts document a living household practice, but do not establish when it began or one standard calabash design.
The 2019 survey describes traditional gourds with large openings. The sources do not give a standard height, diameter or botanical species for the gourd. A separate Western Zambian, or Barotse, method uses a calabash with a low side or bottom opening, plugged between drains. Whey is let out and fresh milk added in repeated rounds. The plug is a useful feature of that method, not a feature to assign to every mabisi vessel. A 2024 study records participants describing three to seven days of repeated additions according to taste and temperature; the 2019 survey describes its own sequence and endpoint variants.
A rural field trial used three calabashes bought from local markets, each about 20 litres in capacity. The researchers prepared them with water and a grass-and-cane mixture left inside for a day, and washed them with water between cycles. They treated previously used calabashes as a route for passive transfer of microbes between batches. In that trial, microbial diversity did not differ significantly between batches fermented in used calabashes and buckets. Active back-slopping, in which a little finished mabisi is added to fresh milk, began acidification without the lag seen in passive or no-back-slopping batches. These results concern the trial's vessels and conditions; they do not prove that gourd material has no effect in every setting, or that reported flavour preferences are imaginary.
Participants in the three-region foodscape study described calabashes as less available where households no longer grew them, and reported turning to plastic or metal buckets because they were convenient and more durable. Some participants said mabisi from calabashes tasted better. That is important testimony about preference, not a controlled sensory finding. The same research records calabash use in present-day communities as well as its decline, so the vessel belongs to a changing practice rather than a single vanished tradition.
A 2019 survey records calabashes among vessels used for mabisi. In 2024 interviews, participants recalled that their forebears fermented milk in gourds. Neither source dates the origin of the calabash form.
The low drain opening belongs to particular Barotse or Western Zambian methods, not every mabisi calabash.
Source →One field trial found no significant microbial-diversity difference between previously used calabashes and buckets under its conditions; this does not establish a universal material effect.
Source →Calabashes are documented in Zambian mabisi production; the cited studies do not establish an exclusive origin or one regional design.
Jars, barrels, skins, leaves, pits and whole rooms decide much of what happens to fermented and cured food. This is how a container works on its contents, and how people in different places chose theirs.
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Himoonga Bernard Moonga et al.; PLOS ONE 14(3), e0213541Vessel form · Process variation · Geography · Cleaning
The art of mabisi production: A traditional fermented milkThe survey records calabashes and other container materials, large openings, and seven production methods.
The Barotse method uses a low, plugged drain for whey; drainage and fresh-milk additions recur, but this form is not universal.
The study describes washing vessels between production cycles and identifies calabash use with particular mabisi methods.
Cited in: A gourd vessel with a local history; A broad opening, sometimes a drain
Anneloes E. Groenenboom et al.; World Journal of Microbiology and Biotechnology 36(12), 184Capacity · Comparative study · Reuse
Microbial population dynamics during traditional production of Mabisi, a spontaneous fermented milk product from Zambia: a field trialThree calabashes of about 20 L capacity were obtained from local markets for a field trial.
Previously used calabashes and buckets showed no significant microbial-diversity difference in that trial; active back-slopping started acidification sooner.
The trial preconditioned calabashes with water and grass-and-cane mixture and washed them between cycles.
Cited in: Reuse and what the comparison found
Taonga Chirwa-Moonga et al.; PLOS ONE 19(12), e0310507Geography · Traditional use · Variant form · Modern change
Past and present foodscapes of a traditional fermented milk, mabisi, in three Zambian regionsInterview participants in Southern, Eastern and Western provinces recalled calabashes and gourds in earlier mabisi production.
Some Western Province participants described a low side opening for whey drainage and repeated fresh-milk additions.
Participants reported reduced availability and a shift to plastic or metal containers; some preferred calabash mabisi, a reported preference rather than a controlled material comparison.
Cited in: A gourd vessel with a local history; A broad opening, sometimes a drain; A vessel becoming less available