Country onion
Also known as bush onion, rondelle, bobimbi, Afrostyrax lepidophyllus
Quick answer
The seed of a Central African forest tree that smells powerfully of garlic and onion, used across Cameroon, Gabon and southern Nigeria to give soups an allium character — with no allium in them.
- Tastes of
- garlic, onion, sulfurous, woody, savoury
- Heat
- Scoville does not apply
- Goes with
- Goat, White fish
- If you have none
- Garlic — see the limits
Other names
What this spice is called elsewhere, and where the translation is not clean.
country onion
English — Nigeria and Ghana
Not an onion or any Allium. The name describes the smell of a forest-tree seed, and a shopper looking for a vegetable will not find one.
rondelle
French — Cameroon
bobimbi
Lingala — Republic of the Congo
Flavour and aroma
Garlicky and savoury with a bitter, woody edge; used in small quantities.
Strong garlic and onion, from sulfur compounds that make up almost the whole of the seed’s essential oil.
Small, hard, dark brown nutlets.
Taste, smell and sensation, channel by channel
Smell, taste and the chemical sense of heat and cold are different senses. Each is listed with the compounds evidenced as producing it.
Smell
- Sulfurous
The smell is of garlic and onion, and the chemistry agrees. Sulfur compounds made up 91.0 to 96.1 per cent of the essential oils of this seed and of garlic tree seed, analysed together, and the authors credit them with the smell of both spices. The largest single compound in both oils was 2,4,5,7-tetrathiaoctane, at 51.5 to 52.9 per cent. The abstract does not say which figure belongs to which seed, and no panel smelled either oil.
Very hard; grated or pounded before use.
Heat
Pungency scale: none — this spice is not pungent
No heat.
- Sulfur-containing volatiles — More than nine-tenths of the seed oil, and the whole of the garlic-and-onion character. The same class of chemistry as the alliums, reached by an unrelated plant.
Pairings
Ranked by how well established the combination is, with the reason and the caveats attached.
Foods
Goat
StrongOne of the grated forest spices of south-eastern Nigerian pepper soup, giving an allium note beneath the heat.
Add alongside: Calabash nutmeg, Scent leaf
White fish
StrongGrated into fish soups and fish pepper soup, where the garlic note suits the fish.
Other spices and blends
Njangsa
ClassicTwo Central African forest seeds pounded together into the spice base of Cameroonian soups and sauces: njangsa thickens and gives a nutty body, country onion the garlic smell.
If you have no country onion
What to use instead, and — more usefully — where each replacement stops working.
Garlic
AcceptableGarlic supplies the allium smell, which is what country onion is used for. It adds sweetness and body that the forest seed does not, and none of its woody bitterness.
| Flavour | Aroma | Colour | Heat |
|---|---|---|---|
| partial | close | different | n/a |
Works for
- Soups and pepper soups made outside Central and West Africa
Does not work for
- Where the dry, woody edge of the seed matters in a spice mixture
Preparation and use
Grate or pound a small amount and add it to the soup base early. It is strong; a little stands in for a good deal of garlic smell.
A spice of Central African and south-eastern Nigerian soups and sauces, grated or pounded in small amounts to give an allium character.
- grinding — Grated or pounded just before use; the smell is released on breaking the seed.
- boiling — Simmered in soups and sauces, where the sharpest notes soften into a savoury allium background.
Storage and freshness
| Form | Good for | Conditions | Fridge |
|---|---|---|---|
| Seed | Not established | Cool, dry and sealed. | No |
Scratch a seed: it should smell sharply of garlic at once.
- Little smell on scratching
- Mould
- Slow loss of the sulfur volatiles once broken
Quality is not the same as safety
A faded seed is a quality matter; mould is a safety one.
Forms
The form the sources describe, and so the one this page is about.
Dried seeds
Hard dried nutlets, grated or pounded as needed.
Botany
Huaceae
A small African family of two genera, unrelated to onions and garlic. The garlic smell is a case of unrelated plants arriving at similar sulfur chemistry.
The seeds above all, dried; the bark is used in the same way in some areas.
A tree of the humid Guineo-Congolian forest whose leaves, bark and fruits all smell strongly of garlic and onion.
Commonly confused with
The smell is similar and the plant is not. Country onion is a dried forest seed used by grating or pounding into a soup; garlic is a bulb. In a soup it supplies the allium note without the sweetness or body of cooked garlic.
Another Central African forest seed pounded into the same soups, for thickening and a nutty taste rather than for smell. The two are often used together.
How it is grown
The plant, how it is propagated and farmed, what threatens the crop, and where it is produced now. Crop diseases here are plant health, not food safety.
The seeds above all, with the bark and leaves also used, of a forest tree sold in south-eastern Cameroon as the “garlic tree”. It is one of the eight forest products that villagers there use and sell most.
A survey of sixteen five-kilometre transects beside Boumba-Bek National Park found the tree in ten of the habitat types recorded, densest in young secondary forest and in forest that floods seasonally, and scarce in food-crop fields, cocoa agroforests and fallows. It regenerates readily, which earlier work in the same area put down to small mammals carrying its seeds through the forest. Nothing in the study describes its flowering, the age at which it bears or any planting of it.
Where it comes from and how it is made
The rainforests of west-central Africa: Cameroon, Gabon, the Republic of the Congo and neighbouring countries, with outlying populations further west.
- Cameroon — origin
- Gabon — origin
- Republic of the Congo — origin
- Nigeria (The south-east) — notable producer
Gathered from wild trees rather than cultivated — a forest product rather than a crop.
Humid lowland tropical forest.
Buying and quality
Whole, grated to order; the seed is very hard and holds its smell well until broken.
- From a Central or West African grocer, as whole dried seeds.
- A sharp garlic smell when a seed is scratched.
History and trade
A local and regional forest-product trade in Central African markets.
Culture
Recorded by tradition rather than merged into one narrative — these are genuinely different practices.
South-eastern Nigeria
Country onion is one of the forest spices of pepper soup and of the soups of the south-east, grated in small amounts.
- In pepper soup
Also documented in south-eastern Nigeria: Calabash nutmeg, Scent leaf, Uziza.
Cameroon
Rondelle is pounded into the spice mixtures of Cameroonian sauces and soups, where it gives an allium note alongside other forest spices such as njangsa.
- Pounded into soup and sauce spice mixtures
What it is called
- French: rondelle
- Lingala: bobimbi
What we do not know
Published openly. A gap we have named is more useful than a gap we have filled with plausible prose.
Not yet established for country onion:
- Propagation
- Archaeological evidence
- Historical timeline
- Ceremonial use
- Traditional medicinal context
- Regulatory limits
- Traditional uses