Slow-fried mutton cooked without water — kosha mangsho — is the feast dish of the Bengali Hindu household.
The word kosha means to reduce by dry-frying; the meat is browned until the fat renders, the spices blacken at the edges, and a sticky, deeply flavoured paste coats every piece. It is served at Durga Puja and at weddings, and it is what Bengali mothers make when a child comes home.
Zone: River Delta
SOURCE: Printed Bengali recipe collection, Kolkata, 2003. Translated from Bengali.
LOCAL NAME: কষা মাংসো
INGREDIENTS
- 800 grams bone-in mutton shoulder (cut into large pieces (or lamb shoulder))
- 2 medium onions (finely sliced)
- 1.5 tablespoons tbsp fresh ginger paste
- 1.5 tablespoons tbsp garlic paste
- 150 grams full-fat yogurt
- 1 teaspoons turmeric
- 1.5 teaspoons cumin powder
- 1.5 teaspoons coriander powder
- 1 teaspoons chilli powder
- 4 green cardamom pods
- 2 black cardamom pods
- 1 cinnamon stick
- 4 cloves
- 2 bay leaves
- 4 tablespoons mustard oil
- 1 tablespoons ghee
- 1.5 teaspoons salt
- 1 teaspoons tsp sugar
METHOD
- Marinate the mutton: Mix the mutton pieces with the yogurt, ginger paste, garlic paste, turmeric, cumin, coriander, chilli powder, and salt. Mix well to coat every piece. Marinate for at least 2 hours, or overnight in the fridge.
- Fry the onions: Heat the mustard oil in a heavy-based pan over medium-high heat until it shimmers. Add the whole spices — cardamom, cinnamon, cloves, bay leaves — and let them sizzle for 30 seconds. Add the sliced onions and fry for 20 minutes, stirring regularly, until very deeply golden and beginning to crisp at the edges.
- The kosha — dry fry without water: Add the marinated mutton to the pan. Increase the heat to high. Fry without adding any water, turning the pieces regularly, for 15 minutes. The yogurt marinade will release liquid, then that liquid will evaporate, and the spices will begin to fry in the rendered fat. This is the kosha — the dry-frying stage. Do not add water.
- Slow cook until sticky: Reduce the heat to low. Add the sugar. Continue to cook, stirring every few minutes, for a further 30–40 minutes. The meat should be completely tender, the spice paste almost black and sticky, coating every piece. If the mixture catches, add a single tablespoon of water only.
- Finish and serve: Finish with a tablespoon of ghee stirred through off the heat. Serve with luchi (fried flatbread) or steamed white rice. Kosha mangsho should be almost dry — it is not a gravy dish.
NOTES
UK: Bone-in mutton shoulder from halal butchers in Whitechapel, Southall, or Bradford. Lamb shoulder as substitute — reduce cooking time by 20 minutes. The bone is not optional for flavour; do not use boneless. Mustard oil essential for the final finish.
US: Bone-in lamb shoulder from halal butchers or Whole Foods. Mutton occasionally available from halal butchers in NYC, NJ, and Chicago. Mustard oil from Patel Brothers. Do not use pre-ground curry powder — the whole spice fry is the recipe.