Nigella is known in Turkish cooking alongside bread and cheese. But what the plant is, and why it gives no flavour in some uses, is less widely understood.
Which plant does it come from?
Nigella is the seed of Nigella sativa.
An annual plant in the buttercup family.
Native to the Mediterranean and southwest Asia.
Its flowers are pale blue or white.
Seed capsules form after flowering.
The small black seeds come out once the capsule ripens.
The seeds are triangular in section, matt black and two millimetres long.
Botanically it comes from neither cumin nor sesame; confusion with those arises from a resemblance in appearance.
Which names get confused with it?
That is a subject creating problems when shopping.
Nigella appears in English as black seed or black cumin.
But black cumin also describes the plant Bunium persicum.
Those are different plants.
The name black onion seed gets used as well; that is entirely wrong and it has no relation to onion.
The names kara sevda tohumu and habbetüssevda appear in Turkish.
Habbetüssevda is of Arabic origin and describes the same plant.
Checking the Latin name — Nigella sativa — is the safest route when buying.
| Use | Quantity | Heat | Result |
|---|---|---|---|
| On bread | 5-8 g/kg flour | In the oven | Aroma opens |
| With cheese | 2-3 g/portion | None | Slight aroma |
| In pickling brine | 5 g/litre | None | Slow transfer |
| On salad | 1-2 g | 1 min in a pan | Clear aroma |
| In yoghurt | 2 g | 1 min in a pan | Clear aroma |
| As oil | 5 ml | None | Intense, bitter |
What is the aroma profile?
The taste of nigella is complex.
Three notes sit together.
The first is bitter and sharp, with a character resembling thyme.
The second is a faintly oniony background.
The third is a warmth close to black pepper.
That profile arises from a compound called thymoquinone.
Thymoquinone sits in the volatile oil of the seed.
The same compound stands at the centre of health research into the plant.
Why does it need heat?
That is the point most often skipped.
The aroma of nigella emerges as the volatile oil gets released.
That oil sits enclosed within the hard shell of the seed.
A raw seed gives very little flavour unless crushed in the mouth.
Heat weakens the shell and frees the oil.
A minute in a dry pan suffices; the seeds are ready once they begin to crackle.
Alternatively they get lightly crushed in a mortar.
That heating already happens in the oven on bread and poğaça; but raw seed scattered over a salad or yoghurt makes only a visual contribution.
How is it used in baking?
That is the most widespread use.
It gets scattered over bread, poğaça, açma and simit.
Five to eight grams per kilogram of flour suffices.
It sticks to a surface brushed with egg.
It can go into the dough as well.
The aroma is softer when it does; the shell does not open to the same degree.
Using it together with sesame is classic.
The two give different aromas and complete each other; sesame is oily and faintly sweet while nigella is bitter and sharp.
Where does it belong with cheese and pickles?
Its use with cheese is widespread in Anatolia.
It gets scattered over white cheese.
Or rolled around a wheel of cheese.
The seeds sit dispersed through the cheese in nigella cheese.
It goes into pickling brine too.
Five grams per litre; the aroma passes slowly into the liquid.
No heating happens in that use.
Long contact takes the place of heat; part of the volatile oil passes into the liquid over months of standing and gives the pickles a slight sharpness.
What is nigella oil used for?
The oil gets obtained by cold-pressing the seed.
It is dark and intensely aromatic.
It gets taken directly or added to food.
Its taste is very sharp; five millilitres a day is a widespread quantity.
It does not get used at high temperature; heat destroys the volatile components.
It goes into salad dressings or cold dishes at the last moment.
The oil gets used for cosmetic purposes too.
Its storage is more delicate than the seed's; it sits in a light-proof bottle in a fridge and gets used within three months of opening.
What is its nutritional content?
Because it gets used in small quantities its nutritional contribution is limited.
But its content is rich.
Twenty grams of protein, forty of fat and eight of fibre per hundred.
It contains iron, calcium and magnesium.
Most of the fat is unsaturated, with linoleic acid dominant.
Since daily use rarely passes five or ten grams, those figures make small contributions in practice.
Health research into the plant concentrates on thymoquinone; laboratory studies report antioxidant and anti-inflammatory effects, though firm conclusions in humans require further research.
How is nigella stored?
The seed contains volatile oil.
That oil evaporates over time.
It sits in an airtight container.
It keeps a year in a cool, dark place.
It does not get stored ground; grinding releases the volatile oil and the aroma disappears within weeks.
The test for aroma is simple; a handful of seeds gets rubbed between the palms and smelled.
Where no clear smell comes the seed has lost its freshness; those seeds still serve visually but they contribute no flavour.
Where and how is it bought?
Nigella appears at herbalists, in shops and on spice counters.
It sells both loose and packaged.
Freshness is uncertain in loose product; when it arrived is unknown.
The production date can be read on a packaged one.
The seeds should be matt black and uniform in size.
No dust or fragments of stalk should sit among them.
Seeds turned brown mean old stock.
Buying a small pack makes more sense; because the product gets used over months, half a large pack gets eaten having lost its aroma, and what looks like a saving turns into a loss.
