Go Back

Bengali Kosha Mangsho Recipe | Authentic Mutton Curry

Bengali Kosha Mangsho is a traditional slow-cooked mutton curry from Bengal, famous for its rich dark masala, bold mustard oil flavor, and tender meat. Unlike thin gravies, this iconic dish features thick, intensely flavored spices that cling beautifully to every piece of mutton, making it a beloved centerpiece for Sunday lunches and festive gatherings.
Print Recipe
Prep Time 20 minutes
Cook Time 1 hour 40 minutes
Marination Time 3 hours
Total Time 5 hours
Servings: 4
Course: Main Course
Cuisine: Bengali, Indian
Ingredients Equipment Method Notes

Ingredients
  

For Marination
  • 500 g mutton bone-in preferred
  • 1 cup thick curd hung curd or Greek yogurt
  • 1 tbsp mustard oil
  • 1½ tbsp ginger paste
  • 1 tbsp garlic paste
  • 1 tsp Kashmiri red chili powder
  • ½ tsp turmeric powder
  • Salt to taste
For the Curry
  • 4 large onions thinly sliced
  • 2 tbsp ginger paste
  • 1 tbsp garlic paste
  • 5 tbsp mustard oil
  • 1 bay leaf
  • 3 green cardamoms
  • 1 cinnamon stick
  • 3 cloves
  • 1 tsp turmeric powder
  • 1½ tsp Kashmiri red chili powder
  • ½ tsp Bengali garam masala
  • 1 tsp sugar optional
  • Salt to taste
  • 1 boiled potato optional
  • ½ cup hot water

Equipment

  • Heavy-bottomed kadai or Dutch oven
  • - Large mixing bowl
  • knife
  • cutting board
  • Wooden spatula
  • measuring spoons
  • Lid with tight fitting cover

Method
 

Step 1: Marinate the Mutton
  1. Combine mutton, curd, mustard oil, ginger paste, garlic paste, Kashmiri red chili powder, turmeric, and salt in a bowl. Coat the meat thoroughly and refrigerate for at least 2–4 hours or overnight for best flavor.
Step 2: Prepare the Spice Base
  1. Heat mustard oil in a heavy-bottomed kadai until it reaches smoking point, then lower the heat slightly. Add bay leaf, cardamoms, cinnamon, and cloves. Allow them to release their aroma before adding sliced onions. Cook until the onions turn deep golden brown.
Step 3: Add Ginger and Garlic
  1. Add ginger paste and garlic paste to the onions. Sauté until the raw smell disappears. Stir in sugar if using to help caramelize the masala.
Step 4: Bhuno the Mutton
  1. Add the marinated mutton along with all the marinade. Cook on medium-high heat for 25–30 minutes, stirring frequently. Continue roasting until the masala darkens and starts sticking to the meat, creating the signature "kosha" texture.
Step 5: Slow Cook the Curry
  1. Pour in ½ cup hot water and mix well. Cover the pan tightly and cook on low heat for 45–60 minutes, stirring occasionally. Cook until the mutton becomes tender and the masala turns thick and rich.
Step 6: Add Potatoes (Optional)
  1. If using potatoes, fry boiled potatoes separately until golden and add them during the final 10 minutes of cooking. Allow them to absorb the flavors.
Step 7: Finish and Serve
  1. Sprinkle Bengali garam masala over the curry and cook for another 2–3 minutes. Serve hot with luchi, steamed Gobindobhog rice, or Basanti pulao.

Notes

• Bone-in mutton gives the richest flavor and texture.
• Mustard oil should be heated until smoking to remove its raw pungency.
• Traditional slow cooking develops deeper flavors than pressure cooking.
• Fried potatoes are a classic Bengali addition and absorb the spicy masala beautifully.
• Kosha Mangsho tastes even better after resting for a few hours or the next day.
• Serve with luchi, steamed rice, Basanti pulao, or gondhoraj lemon.
• Store leftovers in an airtight container in the refrigerator for up to 4 days.
• Freeze for up to 1 week and reheat gently with a splash of hot water or ghee.