Pepperfruit

Also known as pepper fruit, Dennettia tripetala, Uvariopsis tripetala, mmimi, mmimmi, ako

Quick answer

The small peppery fruit of a West African forest shrub of the custard-apple family, chewed fresh in southern Nigeria, offered to guests beside kola nut, and used with its seed to season meat and soups. It has nothing to do with true pepper or with chillies.

Tastes of: peppery, pungent
Heat: Scoville does not apply

Other names

What this spice is called elsewhere, and where the translation is not clean.

Names:

mmimmi
Igbo — Nigeria
Spelt mmimmi in the 2023 taxonomic revision and mmimi in a 2015 review; neither prints tone marks.
ata igebere
Yoruba — Nigeria
The revision gives ata igebere or igberi; the 2015 review spells it ata igbere. Neither prints tone marks.
ako
Edo (Bini) — Nigeria
nkarika
Efik and Ibibio — Nigeria
imako
Urhobo — Nigeria
opipi
Idoma — Nigeria

Reasonable evidencePhylogenomic inference of the African tribe… (Dennettia tripetala, Vernacular names); A Review of the Uses and Medicinal Properti… (Introduction)

Names as the revision compiles them from five Nigerian papers that were not read for this profile. It also records bushpèpè from the label of one specimen collected in Cameroon, without naming the language.

Flavour and aroma

Flavour:

Hot and peppery. Every source read describes the fruit as spicy and says that is why it is eaten; none measures the heat.

Reasonable evidenceA Review of the Uses and Medicinal Properti… (Introduction); In vivo and in silico studies of Dennettia… (Introduction); Phylogenomic inference of the African tribe… (Uses)

Aroma:

Strong and characteristic, in the fruit and in the bark alike. The sources read do not describe it further, and no tasting panel was found.

Reasonable evidenceA Review of the Uses and Medicinal Properti… (Introduction)

Colour:

Green when unripe, turning red as it ripens.

Reasonable evidenceA Review of the Uses and Medicinal Properti… (Introduction)

Texture:

Mostly seed, with a thin layer of hard flesh.

Reasonable evidenceA Review of the Uses and Medicinal Properti… (Introduction)

Heat

Pungency scale: other than Scoville, piperine or isothiocyanate

Scoville: Not applicable — Not a chilli. Nothing read attributes its heat to capsaicinoids, and Scoville figures do not apply.

In practice:

Pungent. Described as spicy and peppery; not measured in anything read.

Reasonable evidenceA Review of the Uses and Medicinal Properti… (Introduction)

Key compounds:

1-Nitro-2-phenylethane (β-phenylnitroethane) — Reported as most of the distilled oil: 61.6 per cent in fresh fruit and 87.4 per cent in dried seed. The figures are from an analysis the paper read here cites, which was not itself read. An instrumental result; its part in the smell or the bite is not stated.
Other constituents of the oil — Linalool, β-ocimene and humulene are named with it as found in the oil of every part analysed, in the same cited analysis.

Reasonable evidenceIn vivo and in silico studies of Dennettia… (Introduction)

Preparation and use

Not yet established — No source read describes how the fruit is prepared for cooking.

Culinary uses:

Chewed fresh as a hot, aromatic snack, and used as a spice. The taxonomic revision records simply that the fruits are used as a spice; a Nigerian paper adds that the seed flavours and seasons meat, vegetables, soup and sausage. No source read gives a named dish or says at what point it goes into the pot.

Reasonable evidencePhylogenomic inference of the African tribe… (Dennettia tripetala, Uses); In vivo and in silico studies of Dennettia… (Introduction)

Storage and freshness

Storage guidance by form
Form	Good for	Conditions	Fridge
Dried whole	Not established	Cool, dark, dry and closed.	—

How to test it: Not yet established — Not described in the sources read.

Quality is not the same as safety

Nothing read describes how long the fresh fruit or the dried seed keeps. Dried seed that smells musty or shows mould should be discarded.

Forms

These forms differ enough to need separate answers: treating them as interchangeable produces a dish that is wrong.

Fresh fruit

The whole fruit, chewed as it is or used in food. This is the form in which it is offered to guests.

Dried seed

Seeds dried in the sun by traders so that they can be sold outside the fruiting season.

Commonly confused with pepperfruit

Direct comparisons, each with the difference that actually changes what you cook.

Pepperfruit vs Grains of Selim

Botany

Scientific name:

Dennettia tripetala Baker f.

Established factPhylogenomic inference of the African tribe… (Dennettia tripetala)

The species was moved to Uvariopsis in 2003 and that name is still met. The 2023 revision of the group, which sequenced it, keeps it in Dennettia and lists Uvariopsis tripetala as a synonym.

Family:

Annonaceae

The custard-apple family, which also holds grains of Selim and calabash nutmeg.

Part used:

fruit, seed

Reasonable evidencePhylogenomic inference of the African tribe… (Dennettia tripetala, Uses); In vivo and in silico studies of Dennettia… (Introduction)

The ripe fruit is the part eaten; it is mostly seed, with a little hard, peppery flesh.

The plant:

A shrub or small tree, 1 to 5 m tall in the description of the 2023 revision, with thin to leathery elliptic leaves about 7 to 15 cm long. The flowers have both sexes and three sepals and three petals, which is how the revision tells it from its nearest relatives. The fruits are green and turn red as they ripen. A 2015 review describes a much larger tree, 12 to 15 m tall; the two accounts have not been reconciled here.

Reasonable evidencePhylogenomic inference of the African tribe… (Dennettia tripetala, Description and Notes); A Review of the Uses and Medicinal Properti… (Introduction)

Commonly confused with

Grains of Selim
Another peppery fruit of the same family from the same forests, and also called a pepper in English. Grains of Selim are long dark pods, dried and often smoked, and are cooked whole in soups; pepperfruit is a small round fruit that is mostly chewed fresh.
Calabash nutmeg
A relative in the same tribe of the family, named Monodoreae after the calabash nutmeg genus. Calabash nutmeg is a hard seed that is roasted and ground, and it is aromatic where pepperfruit is hot.
Black pepper
No relation. "Pepper" in the English name describes the bite, as it does for chillies in West African English.

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.

Shrub

What is harvested:

The ripe fruit, green turning red, which is mostly seed with a little hard, peppery flesh. A Nigerian review gives the fruiting season as March to May; herbarium specimens were in fruit from January to July.

Reasonable evidenceA Review of the Uses and Medicinal Properti… (Introduction); Phylogenomic inference of the African tribe… (Dennettia tripetala, Phenology)

Wild populations:

Given a preliminary status of least concern in the 2023 revision of its group, which records it from Guinea to Cameroon. The revision estimates the extent of its range at 705,671 km² and the area it is known to occupy at 120 km².

Reasonable evidencePhylogenomic inference of the African tribe… (Dennettia tripetala, Preliminary conservation status)

Where it comes from and how it is made

Origin:

A forest plant of West and west-central Africa. Herbarium specimens place it from Guinea to Cameroon.

Reasonable evidencePhylogenomic inference of the African tribe… (Dennettia tripetala, Distribution)

Grown in:

Nigeria — native range. The country where the fruit is best known as a food; a toxicology paper from Nigeria places the tree mainly in the south.
Cameroon — native range
Benin — native range
Ghana — native range
Ivory Coast — native range
Sierra Leone — native range
Guinea — native range

Reasonable evidencePhylogenomic inference of the African tribe… (Dennettia tripetala, Distribution); In vivo and in silico studies of Dennettia… (Introduction)

Harvest:

A seasonal fruit. A review written in Nigeria says the plant usually fruits from March to May; the herbarium specimens behind the 2023 revision were in flower from February to April and in fruit from January to July.

Reasonable evidenceA Review of the Uses and Medicinal Properti… (Introduction); Phylogenomic inference of the African tribe… (Dennettia tripetala, Phenology)

Processing:

Picking — The fruits are picked from the shrub as they ripen from green to red.
Sun-drying — Traders dry the seeds in the sun so that they can be sold after the short season, until the next harvest.

Reasonable evidenceA Review of the Uses and Medicinal Properti… (Introduction)

Climate:

Lowland rain forest, old or regrown, and in West Africa also drier forest on rocky outcrops. The revision gives the altitude of its specimens as 250 to 975 m.

Reasonable evidencePhylogenomic inference of the African tribe… (Dennettia tripetala, Habitat and ecology)

How these steps work: sun drying.

Buying and quality

Whole or ground:

Sold whole, fresh in season and dried out of it. Nothing read describes a ground product.

Editorial judgementFollows from the forms the sources describe.

Safety

Safety statements on SpiceHQ must cite evidence — they cannot be published on editorial judgement.

One animal study of the distilled seed oil

Applies to: The distilled oil of the seed, in rats

A 2021 study gave rats the oil distilled from dried seeds, by mouth, once and then daily, and reported changes in the liver and kidneys that grew with the dose. The study tested a concentrated oil in animals, not the fruit as people eat it, and no regulator or handbook statement on pepperfruit was found. It is recorded here as what one study reports and nothing more.

Reasonable evidenceIn vivo and in silico studies of Dennettia… (Abstract)

Allergens:

Strong evidenceRegulation (EU) No 1169/2011 on the provisi…; Major food allergens under FALCPA and the F…

Not among the substances that must be declared as allergens under EU Regulation 1169/2011 Annex II or under the United States major food allergen rules. That is a statement about labelling law and not about whether allergy occurs: allergic reactions to spices are documented in the clinical literature and are simply not a labelling category. Where a ground spice presents an allergen risk it is usually through adulteration or shared processing equipment rather than through the plant itself.

History and trade

Not yet established — No source read documents the history of pepperfruit as a food. The species was described for science in 1913 from a plant collected at Benin City in 1907; that dates the botany, not the eating.

Trade:

A local market trade. The only thing read about it is that traders dry the seeds to have them for sale all year.

Reasonable evidenceA Review of the Uses and Medicinal Properti… (Introduction)

Culture

Recorded by tradition rather than merged into one narrative — these are genuinely different practices.

Southern Nigeria

Pepperfruit belongs to hospitality before it belongs to the pot. A Nigerian research group writes that the seeds are eaten on their own or with kola nut, garden egg or palm wine when guests are entertained and at weddings, festivals and naming ceremonies. The same group reports its use as a spice to flavour meat, vegetables, soup and sausage. Both statements rest on earlier Nigerian papers that were not read here, and neither names the peoples concerned.

Reasonable evidenceIn vivo and in silico studies of Dennettia… (Introduction)

Chewed fresh, alone or with kola nut, garden egg or palm wine
Served to guests at weddings, festivals and naming ceremonies
Crushed into meat, vegetable dishes and soups

Also documented in southern Nigeria: Njangsa, Ogiri.

What it is called

Igbo: mmimmi

What we do not know

Published openly. A gap we have named is more useful than a gap we have filled with plausible prose.

66% of what we look for is answered15 marked unknown or not applicable5 sources citedEditorial confidence: low

Not yet established for pepperfruit:

Propagation
Archaeological evidence
Historical timeline
Traditional medicinal context
Regulatory limits
Traditional uses

How we grade evidence · The source library