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1
Set a heavy cauldron or wide deep pot over high heat. Add the reserved lamb fat and render it slowly, pressing the pieces against the base, so that the fat melts out fully and carries the deep savour of the lamb into the cooking medium rather than leaving it trapped in the discarded solids. Remove and discard the solids once they are golden; the vessel should hold a visible, fragrant pool of clear lamb fat.
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2
Raise the heat, add the sliced onions and fry in the lamb fat, stirring, until deeply caramelised and golden brown at the edges, so that their sweetness is concentrated and forms the flavour base the whole dish rests on. Add the carrot batons and continue to fry until they have softened and begun to colour, then add the cumin and stir through the vegetables for one minute until the spice blooms fragrant in the hot fat.
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3
Add the bone-in lamb pieces to the pot and brown on all sides in the fat and vegetables, so that each surface seals and colours rather than stewing grey, which would cost the dish both flavour and texture. The pot will smell of roasted lamb and sweet onion together; that colour on the meat is what you are after.
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4
Layer the rinsed rice evenly over the lamb and vegetables and do not stir, so that the rice steams and absorbs from above rather than sinking into the fat below and turning heavy. Pour the measured water gently over the rice surface, season with salt, scatter the raisins across the top, and cover the pot tightly.
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5
Cook over a moderate heat for 20 minutes without lifting the lid, so that the steam trapped inside builds and drives through the rice evenly from bottom to top — breaking the seal releases that pressure and leaves the upper grains undercooked. At the end of 20 minutes, listen at the lid: active bubbling will have ceased, indicating the liquid has been fully absorbed.
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6
Remove the lid; the rice surface should be dry and separate, each grain distinct. The bottom layer of rice, in contact with the lamb fat, will have caramelised against the base of the pot — the prized crust. Serve directly from the pot at the table, eaten by hand in the communal tradition.