Bengali Sunday curry · Long kosha
Kosha Mangsho Recipe (Bengali Slow Cooked Mutton)
Marinate overnight. Kosha patiently. Little water.
Recipe by Farwa ZeeshanTested in the NineFoods home kitchenKosha mangsho is the dark, thick Bengali mutton curry of Sunday lunches, slow fried until the masala clings to the meat. It ends up pale and soupy when water is added early. The fix is a yoghurt and mustard oil marinade, and the kosha: stirring the meat in its own juices on low heat for most of an hour before adding any water.
The 3 laws of kosha mangsho
Why this recipe works
1 hour
Tender meat, deeper flavour.
Water early
Builds the dark colour.
No sugar
A pinch caramelises the onion.
Shopping and prep list
Ingredients
Mangsho
The NineFoods kosha gauge
Is the kosha done?
Look at the meat and oil.
Method · 4 stages
Step by step
Marinate
- Mix mutton with yoghurt, mustard oil, pastes and spices.
Onions
- Fry whole spices and sugar in oil, then onions until deep brown.
Kosha
- Add mutton and stir in its own juices. Use the gauge above.
Tenderise
- Add potatoes and a cup of hot water; cover and cook until tender.
- Finish with garam masala and ghee.
Chef's troubleshooter
What went wrong? Pick the symptom
Why
Water added early.
Fix next time
Kosha first, water last.
Why
Short cooking.
Fix next time
Cook until it falls from the bone or pressure cook.
Why
Onions burnt.
Fix next time
Brown onions on medium.
Why
Too much water.
Fix next time
Reduce uncovered.
Swap smart
Ingredient roles and substitutes
| Ingredient | Job in the dish | Swap with |
|---|---|---|
| Mutton | Main | Lamb shoulder or goat |
| Mustard oil | Signature | Vegetable oil plus a little mustard |
| Yoghurt | Tenderiser | Lemon juice |
| Potatoes | Traditional extra | Leave out |
After the meal
Serve, store, reheat
Serve with
Luchi, paratha or plain rice.
Store
Fridge 3 days; freezes well.
Reheat
Low heat with a splash of water.
How we tested this recipe
Tested in a home kitchen, not a studio
Recipe developed and tested by Farwa Zeeshan, who cooks and tests every NineFoods recipe on a regular home stove.
- Cooked from start to finish with the exact quantities above for 4 servings, using both the metric and US cup measures.
- Every one of the 4 stages was timed at the stove; heat levels and the 'look for' cues are what we saw in the pan.
- The doneness check (is the kosha done) and the troubleshooter come from batches that went wrong, and how we fixed them.
- Reheating and storage advice was checked on leftovers, not guessed.
Keep cooking
Related recipes and guides
Quick answers
Kosha Mangsho FAQ
What does kosha mean?
Slow frying until the masala darkens and clings.
Why is my kosha mangsho pale?
Water was added too early.
Can I use a pressure cooker?
Yes, after the kosha, 5 whistles.
What is it served with?
Luchi or rice.