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1
Soak the mathania chillies in warm water for 30 minutes, so the flesh swells and the skins soften enough to grind to a cohesive, deep-red paste rather than a gritty pulp. Drain and grind to a coarse paste — it must be fully hydrated and hold together. A granular texture at this stage means the chillies were insufficiently soaked and must be returned to water.
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2
Heat the mustard oil in a heavy pot to smoking point, then remove from heat and allow to cool slightly, so the oil loses the aggressive raw edge that would otherwise dominate every other flavour in the pot. Return to medium heat and fry the sliced onions until deep amber and fully softened — the onions must be the colour of dark caramel before proceeding.
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3
Add the garlic and ginger pastes to the onions and cook, stirring steadily, until the raw smell has entirely left the pot — you are looking for a toasted, rounded fragrance with no sharp bite.
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4
Add the mathania chilli paste and cook on medium heat for 8–10 minutes, stirring continuously — this is where the dish lives or dies, because the paste must cook until the oil separates visibly and pools at the edges of the mass, only then is the raw chilli taste gone and the deep crimson colour fixed in the fat. Under-cooking at this stage leaves the curry sharp and one-dimensional. Watch the edges of the pan: pooling red oil is your signal to move on.
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5
Add the bone-in mutton pieces and coriander powder, increase heat, and cook, turning the meat frequently, until every surface of the mutton is sealed and coated entirely in the red paste, so the spiced crust that forms now will hold the flavour through the long braise ahead.
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6
Add salt, reduce heat to low, cover tightly, and cook without adding any water, so the mutton braises in its own released moisture together with the spiced oil, concentrating rather than diluting the sauce. Cook until the mutton is tender and yields easily at the bone — the long, slow cook draws the richness from the bone into the sauce, giving it a glossy, clingy body that boneless meat cannot replicate.
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7
At service, pour one tablespoon of Rajasthani desi ghee directly over the top of the dish. Serve immediately.