Polo ba na'nā

Fragrant Persian steamed rice layered with fresh spearmint and dill: finished with the tahdig crust that defines Iran's greatest culinary achievement

Origin: Persia / Iran

From the journey of Mint.

Persian rice, polo (پلو), is one of the world's great culinary achievements, and the technique of steamed rice with a crisp bottom crust (tahdig) is among the most sophisticated grain preparations in any culinary tradition. The principle of sabzi polo, herb rice, involves layering the partially cooked rice with fresh herbs so the herbs steam into the rice, suffusing each grain with fragrance without losing the herbs' brightness. Na'nā (spearmint) is one of the classic herb combinations for polo, typically paired with dill (shevid) in a ratio that balances the mint's assertive sweetness against the dill's anise freshness. Polo ba na'nā is traditionally served with lamb; completing the ancient Perso-Islamic pairing of mint and lamb that runs from the earliest cookbook manuscripts through to the modern Iranian table. The tahdig (literally 'bottom of the pot'): the crisp, golden layer of rice at the base of the pot, released inverted onto the platter; is the most prized part of the dish: a textural counterpoint to the fragrant steamed rice above, golden and slightly crunchy, perfumed with the mint and dill that have settled to the bottom during cooking.

Ingredients

rice

  • 400 g basmati rice, rinsed until water runs clear and soaked in cold salted water for 30 minutes

herbs

  • 1 large bunch fresh spearmint (na'nā), leaves only, roughly chopped, approximately 30g
  • 1 large bunch fresh dill (shevid), fronds only, roughly chopped, approximately 30g

fat

  • 60 g unsalted butter, cubed, or 4 tbsp neutral oil for a dairy-free version

seasoning

  • 2 tbsp fine sea salt, for the par-boiling water

saffron

  • 0.5 tsp saffron threads, bloomed in 3 tbsp hot water (optional, for colour and fragrance)

tahdig

  • 2 tbsp plain yogurt or 1 egg yolk (for binding the tahdig layer)

Method

  1. Drain the soaked rice. Bring a large pot of heavily salted water to a rapid boil (it should taste like the sea). Add the rice and cook for exactly 5-6 minutes; it should be cooked on the outside but with a visible white core when you bite through a grain. Drain immediately and rinse briefly with warm water.
  2. In the same pot (dried), melt half the butter over medium heat. Mix 2 large spoonfuls of the par-cooked rice with the yogurt (or egg yolk) and the saffron water if using. Press this mixture into the base of the pot in an even layer; this is your tahdig.
  3. Mix the remaining par-cooked rice with the chopped mint and dill. Pile this herb rice over the tahdig layer in a dome shape; do not press down. Poke 5-6 holes through the mound with the handle of a spoon to allow steam to escape.
  4. Dot the remaining butter over the top of the rice dome. Wrap the pot lid in a clean tea towel (or kitchen paper) and cover the pot: the cloth absorbs condensation and prevents it from dripping back onto the rice. Cook over medium heat for 10 minutes, then reduce to the lowest possible heat and cook for a further 35-40 minutes.
  5. To unmould: remove the lid and place a large flat platter over the pot. In one confident movement, invert the pot so the tahdig slides out golden-side-up onto the platter. If it doesn't release immediately, hold the base of the pot briefly over a cold, wet cloth: the thermal shock releases the crust.

Notes

Na'nā specifically means spearmint in Persian. Peppermint would be too aggressive for this dish. The ratio of mint to dill is a matter of personal preference; equal quantities is a good starting point, but many Persian cooks use more dill. Polo ba na'nā is the traditional accompaniment to Shirin polo (sweet rice with orange peel and carrots) at Nowruz (Persian New Year), and also pairs classically with lamb or chicken kebab. The tahdig can also be made with sliced flatbread or sliced potato instead of the yogurt-rice layer.

The Gastrographer

The Gastrographer

Mapping Culinary History

To explore — select an ingredient below.

Journey Point Map Key

Ingredient originTrade or transit route
Became a culinary stapleColonial / trade control
c. 1862 CE
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18 of 18 stops
1862 CE
3000 BCE600 CE1350 CE1862 CE
Mint

Mint

Mentha spp.

HerbsLamiaceae

🌍Origin

Eastern Mediterranean & Levant — c. 1550 BCE (documented), likely much earlier in folk use

🌱Domestication

Mint was never domesticated through selective breeding of a single wild progenitor in the way that grain crops were. The genus Mentha is exceptionally prone to natural hybridisation; even Linnaeus complained that he could not classify it reliably, because the plants refused to hold stable species boundaries. The principal culinary varieties are a continuum of natural hybrids, selected and stabilised by human propagation: Mentha spicata (spearmint) is itself a natural hybrid of obscure parentage, cultivated since antiquity as the culinary archetype; Mentha × piperita (peppermint) emerged in English fields around 1696 as a spontaneous cross between spearmint and water mint (Mentha aquatica), was identified as distinct by the botanist John Ray, and was subsequently cultivated deliberately for its extraordinary menthol content; Mentha arvensis (field mint or corn mint) is native across Asia and Europe and was domesticated independently in India and China for industrial menthol extraction; Mentha pulegium (pennyroyal) is the ancient Mediterranean species used in Greek ritual drink and Roman medicine, still cultivated for its sharp camphor-mint aroma though not safe in large quantities. The named varieties (Moroccan mint, apple mint, Vietnamese mint, which is actually Persicaria odorata and not a true Mentha, spearmint, and peppermint) represent thousands of years of human selection within a genus that evolution, not agriculture, created. A further species warrants acknowledgement beyond the culinary mainstream: Mentha australis (River Mint), native to watercourses across southeastern Australia from Queensland to South Australia, was used by Aboriginal Australians for millennia before European contact, medicinally for headaches, respiratory complaints, and skin conditions, and occasionally as a flavouring in food preparation. Growing wild along the banks of the Murray-Darling river system and its tributaries, it represents a third independent regional Mentha tradition alongside Mediterranean spearmint and the Asian field mint of China and India, a native herb tradition of considerable antiquity that has not yet entered the modern culinary mainstream as a cultivated ingredient.

Global Voyage

Mint's cultivation history is unusually ancient, already documented in Egyptian medicine by 1550 BCE and named in Greek mythology as one of the oldest plants of the Mediterranean world. Unlike most spices that required dramatic long-distance trade routes to reach new markets, Mentha is native to a broad swath of temperate and subtropical regions across Europe, the Middle East, and Asia, meaning many cultures encountered and developed independent mint traditions from locally-occurring species. The result is a palimpsest of parallel histories rather than a single origin story: Mediterranean spearmint, codified by Greek and Roman medicine, spread through the Roman Empire into Northern Europe and was preserved in monastic physic gardens through the Dark Ages; the Arabic-Persian culinary and medicinal tradition of na'nā spread through the Islamic world from the Levant to Morocco, producing one of the world's great hospitality rituals in Moroccan atay; the independently-occurring field mint (Mentha arvensis) of China and India was cultivated for medicinal use and eventually became the world's largest source of menthol; and the revolutionary English peppermint industry of the 18th century extracted and concentrated menthol from the Mitcham fields of Surrey, producing the sharp, clean-cold mint flavour that became the basis of modern confectionery, toothpaste, and cocktail culture. Each strand is distinct in botany, in culture, and in culinary application; all are connected by the genus name Mentha but arrive at 'mint' from different directions. A fifth thread, less often told, runs through Moorish Al-Andalus: the Islamic na'nā tradition of the Córdoban palace gardens and the Andalusian agronomical manuscripts gave spearmint the Spanish name hierba buena (good herb), which crossed the Atlantic with Castilian colonists to the Andes, where it became the defining herb of Colombia's agua de panela, one of the world's most universally consumed daily beverages and among the very few drinks on earth in which fresh mint is a primary flavouring rather than a garnish.

🍽Modern Culinary Role

Mint is among the world's most widely grown herbs, cultivated on every inhabited continent. Global production centres on three species: Mentha arvensis (field mint, grown primarily in Uttar Pradesh, India and in China, supplying approximately 75% of global menthol for pharmaceutical, confectionery, and personal care applications), Mentha spicata (spearmint, grown in Morocco, Spain, the USA, and the Middle East, supplying culinary mint for North African tea culture and global cooking), and Mentha × piperita (peppermint, grown in the Pacific Northwest of the USA, Oregon and Washington, and in Europe, for confectionery, pharmaceutical, and liqueur flavouring). The four main culinary varieties carry entirely different characters and applications that should not be confused: spearmint (M. spicata) is the culinary archetype: sweetly aromatic, caraway-forward, used in tabbouleh, mint sauce, mojitos, raita, and the majority of cooked mint applications worldwide; peppermint (Mentha × piperita) is menthol-dominant, sharp and cooling, used in confectionery, cocktails, herbal teas, and the classic after-dinner mint; Moroccan mint (M. spicata var. crispa 'Moroccan', sometimes called nana) is a spearmint cultivar with particular sweetness and low bitterness, cultivated specifically for the Maghrebi tea tradition; and field mint (M. arvensis) is the industrial menthol source and the dominant fresh cooking mint across Southeast Asia and China. Pennyroyal (M. pulegium), the ancient Mediterranean species used in kykeon and Roman condiments, is no longer in common culinary use and is not safe for consumption in large quantities. The cultural breadth of mint is unmatched among culinary herbs: it appears in Islam's most widely performed hospitality gesture (Moroccan atay), in America's most ceremonial cocktail (the mint julep), in Lebanon's national salad (tabbouleh), in Vietnamese pho and fresh spring rolls, in British post-dinner confectionery, in Indian street food chutneys, in Persian yogurt dips, and in Greek ritual drinks: a herb that has found a culturally essential role on every inhabited continent.

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