aged-citrus-zest · tangy · fermented-sweetness
14 d
brine + sun cycle
turn black, rattle dry
3-4
limes per pot
pierced into Iranian khoresh
1000 y
on Gulf tables
Omani and Iraqi staple
85%
moisture loss
from fresh lime to loomi
Dried lime, known as loomi in Arabic, limu omani in Persian and noomi basra in Iraqi kitchens, is a whole Citrus aurantifolia lime brined in salt water and sun-dried for two to three weeks until the pulp turns to a dry, hollow black crumb and the whole fruit weighs almost nothing. It is emphatically not kaffir lime, which is a different species (Citrus hystrix) used for its leaves. Loomi is a fermented and oxidised ingredient: what begins as a bright, floral lime finishes as something astringent, smoky, slightly medicinal, with a fermented funk that reads halfway between fig and tamarind. It anchors Persian stews like gormeh sabzi, ash-e reshteh and fesenjan, Iraqi dolma and masgouf side sauces, Kuwaiti and Emirati machboos, and Omani shuwa marinades. Cooks either pierce the whole lime and throw it into the simmering pot so it gradually swells and releases its sour oils, or crack it and grind the inside to a dark powder for spice rubs.
Tasting notes
aged-citrus-zest · tangy · fermented-sweetness
Sour, astringent, fermented, slightly smoky, with a resinous citrus-peel top note and a tamarind-fig base. Funkier than fresh lime, drier than tamarind, with a medicinal bitterness that reads as sophistication in small doses and as a mistake in large ones.
Flavor compass
Batinah coast of Oman, Iranian Hormozgan, lower Gulf, OM.
Boiled in salt brine then sun-dried until the inside turns black and hollow. Mahogany to black, almost brittle. The grade for Gulf machboos, Emirati rice dishes and Omani shuwa — deep fermented-sour funk with dried-citrus edges.
Iranian version dried shorter and lighter, pale beige to tan, less bitter than the Omani. Ground finely for gormeh sabzi, khoresht gheymeh and the classic Persian herb stews — more tangy-bright, more fruity, less funk.
Iraqi style from the Shatt al-Arab, a middle grade between Omani black and Persian pale — medium brown, often used whole in Iraqi mandi and biryani-style rice. Thinner skin, sweeter entry, pronounced aged-citrus and tangy backbone.
Key limes (Citrus aurantifolia) come off the Batinah groves green, thin-skinned, fiercely acidic.
Whole limes plunge into boiling salt water for a few minutes — sets the skin, seeds the fermentation.
Limes are spread on rooftops and racks under the Gulf sun. Skin tightens, juice concentrates.
Enzymatic browning and slow ferment push the limes from khaki to mahogany to true black.
A finished loomi is light, hollow, rattling. Seeds knock inside like dice.
Toss pierced into stews; grind powder fresh for rubs. Flavour holds a year in an airtight jar.
The molecules that make it taste like Kampot — and not like anything else.
GC-MS of loomi: limonene still leads the top, but long sun and slow ferment layer on furanones, dimethyl sulfide traces, and caramelised sugars that read as 'smoky'.
3.1%
Essential oil
of dried whole fruit
58%
d-Limonene
of volatile oil
8.5%
Moisture
post sun cycle
60+
Volatile compounds
identified after fermentation
The citrus backbone: still lime, duller, drier.
Pine-lilac, softens the raw acid into something floral.
Caramel-strawberry — the 'smoked' illusion in a non-smoked fruit.
Bitter-green citrus pith, the astringent bite.
Fermented savoury thread, almost shellfish in the background.
Fresh lemon-verbena ghost, fainter after drying.
| Pepper | Limonene | Oil |
|---|---|---|
★ Omani Batinah Benchmark loomi, clean ferment | 90% | 3.1% |
Iranian Hormozgan (limu omani) Slightly softer, more mahogany than black | 88% | 2.9% |
Iraqi Basra Smaller fruit, more astringent dolma profile | 85% | 2.7% |
Fresh key lime Reference: before 85% moisture loss | 0% | 4.2% |
Sumac Same sour job, fruit-acid route not citrus | 0% | 0.4% |
Nizwa, Ad Dakhiliyah · est. 1991
“A Nizwa-based house founded by two Omani chemists to standardise the production of loomi — the brine-boiled, sun-dried lime that defines Gulf cuisine.”
MethodsSalt-brine boil (10–12% salt) until skin is saturated, sun-dry on raised mesh 6–10 weeks in dry inland heat, hand-sort by colour (amber, brown, black), store in hessian sacks in climate-stable shade, vacuum-pack for export to preserve the distinctive hollow-fermented interior.
How the world cooks with it.
3 signature dishes
No Iranian khoresh is complete without three pierced limu omani bobbing in the pot — the sour backbone under the meat.
Herb stew of parsley, fenugreek, dried lime — the national dish, dark-green and tart.
Thick noodle-legume soup finished with kashk and whole dried lime.
Pomegranate-walnut stew; a single loomi cuts through the sweet walnut fat.
What it's called, from Phnom Penh to Palermo.
لومي
黑柠檬
Dried lime (loomi)
Citron noir séché
Schwarze Limette
सूखा नींबू
Lime nero essiccato
ドライライム
Limão-preto seco
Lima seca (loomi)
Protein
Plant
Drink
Whole key limes (Citrus aurantifolia) boiled briefly in salt brine, then sun-dried on rooftops for two to three weeks until they turn mahogany-black, hollow, and rattle when shaken. Known as loomi in Oman, limu omani in Iran, noomi basra in Iraq, and simply black lime in the West.
Sources