Why this recipe works
Rogan josh gets its name from its colour and oil (rogan, fat; josh, heat of cooking). The famous deep red is Kashmiri chilli, which is about colour, not heat. The real work is the long, slow braise: tough cuts of mutton cook for over an hour until the collagen melts to gelatin and the meat turns spoon-tender. Yogurt and ground fennel and ginger give it the distinctly Kashmiri aroma.
Ingredients
Method
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1
Heat the ghee or mustard oil and bloom the whole spices, then brown the mutton pieces well on all sides.
Why brown it: searing the meat builds a deep, savoury crust through the Maillard reaction, the base flavour that a braise then draws out over time.
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2
Lower the heat and stir in the whisked yogurt a little at a time, then the Kashmiri chilli, fennel and dry ginger.
Why slowly: adding yogurt gradually and off a hard boil stops it splitting, so it melts into a smooth gravy instead of curdling.
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3
Add a little water, cover, and braise very low for 60 to 90 minutes until the mutton is fork-tender.
The soul of it: tough, collagen-rich cuts need long, gentle heat, the collagen slowly turns to gelatin, which is what makes braised mutton meltingly soft and the gravy full-bodied.
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4
Uncover and reduce until the oil surfaces and the colour deepens to a rich red.
The colour: that glossy red-orange, the rogan, is the Kashmiri-chilli-stained fat rising as the gravy reduces, the classic finish.
An honest word
Rogan josh is a rich, festive dish: mutton is fattier than chicken, and the traditional recipe uses a generous amount of ghee or oil. It is worth every bit as an occasional feast. Lighter notes: trim visible fat, skim the surface oil after cooking if you like, use a modest amount of ghee, and serve with plenty of rice and a fresh salad. The slow braise, not the fat, is what makes it special.