Bengali Kosha Mangsho is a slow-cooked mutton curry where meat is braised with caramelized onions, ginger-garlic, tomatoes, and yogurt until the gravy becomes thick and deeply spiced. The defining trait is its concentrated, caramelized masala that coats tender meat.
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Marinate the mutton pieces with yogurt, ginger paste, garlic paste, turmeric powder, red chili powder, and salt. Let it marinate for at least 2 hours or overnight in the refrigerator.
Heat mustard oil in a heavy-bottomed pan or pressure cooker over medium-high heat until it reaches smoking point, then reduce to medium heat.
Add bay leaves, green cardamoms, cloves, and cinnamon stick. Fry for about 30 seconds until fragrant.
Add sliced onions and fry on medium heat, stirring frequently, until they turn deep golden brown. This step is crucial and may take 15–20 minutes.
Add the tomato puree and cook until the oil separates from the mixture.
Add coriander powder and cumin powder and stir well.
Add the marinated mutton and cook on high heat for 5–7 minutes, stirring continuously to coat the mutton well with the masala.
Reduce the heat to low, cover the pan, and slow-cook the mutton for 45–60 minutes, stirring occasionally, until the mutton is tender and the gravy is thick and dark.
If using a pressure cooker, cook for 3–4 whistles on medium heat after the first whistle.
Once the mutton is cooked, add garam masala powder and adjust salt to taste.
Cook uncovered on high heat for a few more minutes, stirring continuously, until the masala coats the mutton pieces and the oil separates — this is the 'kosha' (dry-roasted) finish.
Garnish with fresh coriander leaves and serve hot with steamed rice, luchi, or paratha.
Store in an airtight container in the refrigerator for up to 3 days. Reheat on the stovetop over medium heat with a splash of water; freeze for up to 1 month.
Yes, but reduce cooking time to 45–60 minutes. Chicken cooks faster than mutton and will dry out if cooked too long.
The gravy should be thick and cling to the meat—almost a paste. If too thin after cooking, simmer uncovered until reduced and concentrated.
Use shoulder or neck meat with some fat and connective tissue; these cuts become tender and flavorful after slow cooking.
Yes. Cook fully, cool, and refrigerate up to 3 days. Reheat gently on stovetop, adding a splash of water if needed.
Stir occasionally, especially in the final 20 minutes when the gravy thickens. Keep heat at medium or medium-low.
