Calcutta Kitchen

Recipe

Mutton Kosha (মাটন কষা)

Traditional Bengali Mutton Kosha made with slow-cooked mutton, aromatic spices, onions and curd for a rich, deep-flavoured gravy.

Traditional Bengali Mutton Kosha served in a bowl with thick glossy gravy and tender slow-cooked mutton.

Recipe information

Prep time
30 min
Cook time
120 min
Total time
330 min
Servings
6
Difficulty
hard

About this recipe

Mutton Kosha is one of Bengal's most celebrated festive dishes, known for its rich flavour, deep colour and slow-cooked texture. Unlike quick pressure-cooked versions, this traditional recipe develops its signature taste through patient browning of onions, gradual cooking of the meat and careful layering of spices, resulting in a thick glossy gravy that pairs perfectly with Basanti Pulao, luchi, paratha or steamed rice.

Equipment

Prabha Heavy Gauge Round Bottom Kadhai

Prabha Heavy Gauge Round Bottom Kadhai

Heavy-gauge round-bottom iron kadai that distributes heat evenly, retains heat exceptionally well, and is perfect for frying, sautéing, and slow cooking.

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Atomberg Zenova Mixer Grinder

Atomberg Zenova Mixer Grinder

Powerful mixer grinder designed for grinding spices, making fresh masalas, chutneys, batters, and smooth pastes with consistent results.

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Royalkart Measuring Cups & Spoons

Royalkart Measuring Cups & Spoons

Lightweight measuring cups and spoons for accurately measuring both dry and liquid ingredients during everyday cooking and baking.

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Ingredients

  • For the Marinade

  • For the Chili Paste

  • For the Gravy

  • Finishing

Cooking method

  1. Marinate the Mutton

  2. Whisk the curd until smooth

  3. Mix with salt, raw papaya paste, grated onions, turmeric and garam masala (or biryani masala)

  4. Coat the mutton thoroughly

  5. Marinate for at least 1 hour, preferably 2–3 hours

  6. Prepare the Chili Paste

  7. Remove the seeds from the Kashmiri chilies

  8. Soak them in hot water for 15–20 minutes

  9. Blend with garlic, ginger, green chilies and a little water into a smooth paste

  10. Fry the Onions

  11. Heat the oil generously

  12. Add cloves, cinnamon, green cardamoms and black cardamom

  13. Once fragrant, add the sliced onions

  14. Do not add salt

  15. Fry patiently until the onions become deep golden brown

  16. Build the Masala

  17. Add the prepared chili paste

  18. Cook until the raw smell disappears

  19. Add turmeric and coriander powder

  20. Add salt and sugar

  21. Cook slowly until the masala releases oil

  22. Cook the Mutton

  23. Add the marinated mutton

  24. Increase the heat and stir for several minutes

  25. Cover with a lid and allow the moisture released from the curd to cook the meat

  26. Slow Cooking

  27. Every 10 minutes, open the lid, stir well and check that the bottom is not sticking

  28. Cover again and repeat until the mutton is around 80% cooked

  29. Optional Extra Gravy

  30. If you want extra gravy, add ½ cup whisked curd once the meat is about 80% cooked

  31. Continue cooking using the same covered-and-stirring cycle

  32. Adjust Moisture

  33. If the gravy becomes too dry before the meat is tender, add a little hot water at a time

  34. Cover and continue cooking

  35. Avoid adding too much water at once

  36. If the Bottom Sticks

  37. If the bottom is brown, add hot water and scrape the browned bits into the gravy

  38. If the bottom has turned black or burnt, transfer the curry immediately to another pan without scraping the burnt bits

  39. Finish

  40. Continue cooking until the mutton is fork-tender and the gravy is thick and glossy

  41. Sprinkle garam masala (or biryani masala)

  42. Add ghee if desired

  43. Mix well and switch off the heat

Pro tips

  • Use large mutton pieces of around 60 g each
  • Raw papaya with skin helps make the meat significantly more tender
  • Grated onions create a smoother kosha texture than chopped onions
  • Slice the frying onions across the grain so they break down faster
  • Whole Kashmiri chilies give a richer natural red colour than chilli powder
  • Never rush Mutton Kosha; its flavour develops through slow cooking
  • The signature colour comes from patient browning, sugar caramelisation and slow cooking, not food colour
  • Biryani masala can be used instead of garam masala for a deeper aroma
  • Serve with Basanti Pulao, luchi, paratha or steamed rice

Frequently asked questions

Why should I use raw papaya in the marinade?

Raw papaya helps tenderize the mutton during marination, making it suitable for slow cooking.

Why shouldn't I add salt while frying the onions?

Salt draws moisture from the onions and can slow down the browning needed to develop the deep colour of Mutton Kosha.

Can I use biryani masala instead of garam masala?

Yes. Biryani masala can be used for a deeper and more aromatic finish.

What should I do if the bottom starts sticking?

If the sticking is brown, add a little hot water and scrape the browned bits into the gravy. If it is black or burnt, transfer the curry to another pan without scraping the burnt layer.

Can I add more gravy?

Yes. Add ½ cup whisked curd when the mutton is around 80% cooked and continue slow cooking.

Watch the recipe

Video preview: Mutton Kosha Watch on YouTube

Mutton Kosha

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