Why this recipe works
The Hyderabadi kacchi method is the hard, glorious one: the mutton goes in raw, marinated in yogurt and spices, layered under par-cooked rice and sealed, so it cooks entirely in the dum steam. The yogurt (and often a little raw papaya) tenderises the tough meat, the collagen melts over the long, slow steam, and the rice perfumes from within. Timing and a tight seal are everything.
Ingredients
Method
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1
Marinate the raw mutton in yogurt, ginger-garlic, raw papaya, fried onions and whole-spice powder for several hours.
Why yogurt and papaya: both are natural tenderisers, their acids and enzymes break down the tough muscle so it turns meltingly soft in the steam.
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2
Par-boil the basmati with whole spices until about 70 percent done, then drain.
Why 70%: the rice finishes in the dum steam, cooking it fully now would leave it mushy after the long second cook.
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3
Layer the raw marinated mutton at the bottom and the par-cooked rice on top, with mint, saffron milk and ghee.
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4
Seal the lid tightly and cook on very low heat (dum) for a long time, until the raw mutton is tender and the rice is fragrant.
The soul of it: in the kacchi method the sealed steam cooks the raw meat and the rice together, so the flavours meld and the rice is perfumed from within, that is what makes it the finest biryani.
An honest word
Mutton biryani is a grand feast dish, not everyday food: mutton is fatty, the rice is generous, and it is rich with ghee. It is glorious as the occasional celebration it is meant to be. Lighter version: trim the mutton, use a modest amount of ghee, a bit less rice, and serve with a fresh raita and salad. The magic is in the dum and the marinade, not the fat.