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1
Heat the oil in a wide, heavy pan over a medium-high flame. Add the sliced onions and fry, stirring regularly, until they are a very deep golden brown and crisp throughout — birista must be dark, not pale, because only that depth of colour carries the caramel sweetness needed to balance the barberry tartness later. Remove with a slotted spoon and drain on paper.
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2
Bring a large pot of generously salted water to a full boil and add the drained basmati. Par-cook until each grain has lengthened and the outer layer is just tender but the centre remains firm, then drain immediately, so the grains finish cooking in the dum rather than turning soft and clumping in the pot. The grains must hold their shape when pressed between two fingers.
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3
In a small pan, warm the ghee or butter over a medium flame and add the drained zereshk and the pinch of sugar. Sauté briefly, stirring, until the barberries are plump, glistening, and very slightly caramelised at the edges — this is where the dish lives or dies, because skipped, the barberries remain hard and aggressively tart, but done properly, their sharpness resolves into a clean, bright counterpoint that runs through every mouthful of the finished rice.
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4
In the base of a heavy-bottomed pot suitable for dum cooking, layer half the par-cooked rice, then distribute the cooked meat and the birista evenly over it, and scatter the sautéed zereshk across that layer before covering with the remaining rice. Drizzle the saffron water over the top so the golden colour distributes unevenly across the surface grains, giving the finished dish its characteristic patchwork of white and gold rather than a flat, uniform tint.
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5
Seal the pot tightly — with a lid wrapped in a clean cloth, or with a layer of foil pressed under the lid — so the steam is trapped inside and cooks the rice through by its own heat rather than escaping and leaving the centre grains chalky. Set over the lowest possible heat and cook undisturbed for 25–30 minutes; the dum is complete when the steam has condensed and the kitchen carries the warm, floral scent of saffron and caramelised onion together.
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6
Remove the lid. The surface rice should be dry and separate, with patches of deep saffron gold against the white grains and the vivid red of the barberries visible at the top. The colour contrast of red barberries, saffron-gold rice, and dark brown birista is the visual confirmation that the dish is ready to serve.