Kosha Mangsho Recipe (Bengali Mutton Curry)

This iconic dish is a staple at traditional Bengali feasts, especially during Durga Puja and Sunday family meals. It is also made for special occasions, including birthdays and weddings.

Unlike regular mutton curry, Kosha Mangsho is “kosha-ed,” meaning it is slow-bhunao-cooked, where moisture evaporates and flavors concentrate. The result is thick, clingy, velvety gravy coating the tender, melt-in-your-mouth meat.

This dish is traditionally made in an iron kadai, which gives it a deep, dark brown color. But if you don’t own one, make it in a regular pan. There will be a slight difference in taste and color, but it will still be very delicious.

Here are some more authentic Bengali recipes that you might want to try: Begun Bhaja, Doi Murgi, Bengali Cholar Dal, Chicken Rezala, and Chaler Payesh.

How To Make Mutton Kosha

Marinate The Mutton

Step 1: Rinse 1 pound (½ kg) bone-in goat mutton (cut into 1 and ½-inch pieces) well with water and drain thoroughly.

Step 2: Mix the following ingredients in a large mixing bowl.

• mutton pieces
• ¼ cup plain yogurt
• 2 teaspoon ginger garlic paste
• 1 tablespoon mustard oil

Step 3: Cover the bowl with a lid and refrigerate it for 3-4 hours.

Make The Curry

Step 4: Pull the marinated mutton from the refrigerator and put it on the counter.

Step 5: Heat 4 tablespoon mustard oil over medium-high heat in a large pan. An iron pan is best, as it gives the dish a deep blackish color, but if you don’t have one, use any heavy-bottom pan.

Step 6: While the oil is heating, lightly crush the following whole spices in a mortar and pestle. Crushing the spices helps release their flavor into the oil.

• 2 whole black cardamoms
• 3-4 whole green cardamoms
• 1-inch piece of whole cinnamon stick
• 2-3 cloves

Step 7: When the oil is hot, add the following ingredients and fry for 4-5 seconds.

• 2 bay leaves (cut into 2-3 pieces)
• crushed whole spices
• 3-4 whole dry red chilies
• 1 teaspoon sugar to the pan

Step 8: Add 1 and ½ cups of thinly sliced onions and cook until golden brown (6-8 minutes). Stir at regular intervals.

Step 9: Add 1 teaspoon chopped ginger and 1 teaspoon chopped garlic, and cook until the onions are nicely browned, stirring frequently. It will take 8-10 minutes.

Note: If you like a creamier gravy, then blend the browned onions at this stage using an immersion blender or a mixer. Then follow the rest of the recipe as it is.

Step 10: Now add the marinated mutton pieces along with the marinade and potato halves and cook for 5-6 minutes on high heat.

Step 11: Add the following ingredients and cook for 2-3 minutes.

• 2 teaspoon coriander powder
• 1 teaspoon turmeric powder
• 2 teaspoon Kashmiri red chili powder
• 1 teaspoon cumin powder
• 1 teaspoon salt

Step 12: Add ½ cup of whisked plain yogurt and cook for 5-6 minutes.

Step 13: Reduce the heat to low. Add a splash of hot water (50-60 ml) to the pan and stir to combine.

Step 14: Cover the pan with a tight-fitting lid and cook for 15-20 minutes.

Step 15: Now repeat the process of adding some water and cooking the mutton until the meat is tender (1.5-2 hours). Scrape the bottom of the pan at regular intervals to incorporate the browned bits with the masala. This process will help the mutton to develop a rich brown color.

Note – Be careful not to burn the gravy at the bottom of the pan.

Step 16: Finally, stir in the following ingredients.

• ½ teaspoon garam masala powder
• 3-4 slit green chilies
• 1 tablespoon ghee

Step 17: Check for salt and add more if needed.

Step 18: Cook for another 3-4 minutes until the gravy is slightly thickened. Serve hot.

Serving Suggestions

Kosha Mangsho tastes the best the next day, so plan accordingly.

It is usually served with Soft Bengali Luchi (puffed fried bread) or a portion of the Mildly Sweet Bengali Mishti Pulao. It also pairs well with steamed rice, phulka roti, or jeera rice.

Storage Suggestions

You can refrigerate the leftover kosha mangsho for upto 2 days in an airtight container. Reheat in a pan or microwave. Add a little hot water when reheating if the gravy has become too thick.

It can be frozen for up to a month in an airtight freezer-safe container. Thaw it for a few hours at room temperature, then reheat before serving.