Bokbunja-ju
Korean black raspberry wine: crushed bokbunja berries with their seeds, sweetened to 20 °Brix, fermented 15 days at 25 °C with wine yeast, filtered and matured three months.
Built structures · Pits and cavities
Banana ripening pit (urwina)
urwina
The Rwandan urwina is a conical, leaf-lined earth pit that warms green brewing bananas before they are peeled, crushed for juice and fermented separately.
The urwina and its setting
In Rwanda, green brewing bananas have been ripened underground before their juice is extracted for local beer. A 2007 farmer survey calls the pit urwina and reports that 93.4% of respondents used an underground method. The term here names the fruit-ripening place; it does not mean the later pit or hole used in some accounts for warming containers of extracted juice. These are separate stages and structures. A 2006 University of KwaZulu-Natal dissertation describes one example as a conical excavation about one metre deep. It documents the pit in Rwanda, but does not establish a date for the practice's origin or a single place where it began.
How the pit is prepared and used
The described sequence begins with dry banana leaves burned in the excavation to warm it. The pit is then lined with fresh banana leaves. Split bunches of green fruit are heaped inside, covered with another layer of leaves, and finally covered with soil. The leaves separate the fruit from the earth and form the documented lining and cover; the sources do not specify a designed liner, masonry, vent, drainage, width, or engineered closure. They also give no measured internal temperature. The dissertation reports five days of ripening; the survey gives five days as typical, with a range of three to eight days depending on climate. That range records observed practice, not a universal schedule or a controlled temperature process.
After ripening
Once ripe, the bananas are removed for peeling and juice extraction. The FAO account describes that preparation and subsequent fermentation as later operations; they are not part of this pit's function. The dissertation likewise separates ripening from pressing banana pulp with grass and from later fermentation of juice with sorghum. The pit is therefore a post-harvest preparation structure for brewing fruit, rather than a fermenting vessel. The sources do not give a construction drawing or safety evaluation. They establish the buried form, leaf lining, earth cover and heat-before-loading sequence, but not specifications for adapting or rebuilding a pit today.
History
A Rwandan farmer survey published in 2007 names the underground banana-ripening pit urwina. A 2006 dissertation records its form and sequence; neither source establishes when the practice began.
Site
SettingA pit dug in the ground for warming and ripening green brewing bananas.
GroundA conical excavation about one metre deep in the documented dissertation; leaves line its interior and soil covers the leaf-covered fruit.
ClimateThe farmer survey says the ripening duration depends on climate, without specifying a temperature or climate range.
NotesPit width, detailed soil conditions, drainage and ventilation are not stated in the sources.
A build is made where it stands: moving it means building it again.
How it is built
Risks and precautions · Standard risk
Open fire during preheating
Dry banana leaves are burnt inside the pit before fresh leaves and fruit are loaded.
Hazard sourceKeep the fruit and fresh lining out of the pit during the documented leaf-burning preheat; line and load only afterward.
Control sourceThe accounts do not specify pit ventilation, fire separation, excavation stability, or modern safety controls; this historical description is not construction or fire-safety guidance.
Materials
- Dry banana leaves — Burnt in the pit to warm it before lining
- Fresh banana leaves — Line the pit and cover the split bunches
- Soil — Cover the leaf layer over the bananas
- Dig a conical pit in the ground, about one metre deep in the documented Rwandan example.
- Burn dry banana leaves in the pit to warm it, then line it with fresh banana leaves.
- Heap split green banana bunches into the lined pit; cover them with more banana leaves and soil.
- Leave the covered fruit to ripen. Sources describe five days in one account and a three-to-eight-day range in a farmer survey, with climate affecting the timing.
Places
Rwanda
Traditional preparation · Country evidenceThe farmer survey and dissertation document the underground banana-ripening method in Rwanda; no locality is claimed.
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Sources
Institut des Sciences Agronomiques du Rwanda (ISAR) / Rwanda Agricultural Board; hosted by ResearchGateMethod · Geography · Name
Banana production, post harvest and marketing in RwandaThe 2007 survey names the underground ripening pit urwina, reports that 93.4% of surveyed respondents use the underground technique, and gives a common five-day duration with a three-to-eight-day range depending on climate. It describes dried banana leaves used to warm the pit, followed by green bananas, non-dried banana leaves and soil.
Cited in: The urwina and its setting; How the pit is prepared and used; After ripening
University of KwaZulu-NatalMethod · Dimensions · Visual reference
Establishing genetic diversity of Rwanda highland banana using random amplified polymorphic DNA markersSection 1.8.2 describes a conical pit about one metre deep, dry banana leaves burnt in the pit before fresh leaves line it, split bunches loaded and covered with more banana leaves and soil, with five days for ripening. Figure 1.8.2A is captioned as fresh banana leaves lining the warm pits.
Cited in: The urwina and its setting; How the pit is prepared and used; After ripening
Food and Agriculture Organization of the United NationsMethod · Context
Traditional post-harvest technology of perishable tropical staples: Chapter 5, bananas and plantainsThe chapter describes traditional banana-beer production in Uganda and Rwanda. It says Rwanda's ripening is aided by fire near or hot ashes in the hole containing the fruit, with green fruit ripening in a leaf- and soil-covered pit for five to six days before peeling and separate juice extraction and fermentation.
Cited in: How the pit is prepared and used; After ripening