Kosha Mangsho (Slow-Cooked Caramelised Mutton)
Kosha Mangsho (Slow-Cooked Caramelised Mutton) is a medium Bengali recipe that serves 4. 500 calories per serving. Recipe by Bong Eats on YouTube.
Prep: 30 min | Cook: 3 hrs 15 min | Total: 4 hrs 5 min
Cost: $18.91 total, $4.73 per serving
Ingredients
- 1 kg Mutton (leg pieces with bone) (Include a good proportion of meat, fat and bone for flavor)
- 10 pcs Garlic cloves (Will be crushed into a paste with green chilies)
- 40 g Ginger paste (Fresh ginger grated or store‑bought paste)
- 5 pcs Green chilies (About 20 g, adjust to heat preference)
- 150 g Plain yogurt (Use full‑fat for richness; can increase to 200 g for more tang)
- 10 g Salt (for marination) (Adjust to taste)
- 5 g Turmeric powder
- 5 g Shahi garam masala
- 3 g Kashmiri red chili powder (Mild, gives color)
- 3 g Coriander powder
- 3 g Cumin powder
- 20 ml Mustard oil (Heat until it lightly smokes; gives characteristic flavor)
- 1 pod Whole spices – big (black) cardamom
- 1 large Cinnamon stick
- 10 pcs Cloves
- 4 pcs Dried red chilies
- 6 pcs Bay leaves
- 1 pod Black cardamom
- 10 pods Green cardamom
- 400 g Sliced onions (About 2 large onions, sliced thick for caramelisation)
- 10 g Sugar
- 8 g Salt (for cooking) (Adjust at the end if needed)
- 100 g Ghee (clarified butter) (Finishing butter for shine and richness)
- 1 liter Water (Added gradually during simmering)
Instructions
Marinate the mutton
In a mixing bowl combine the mutton pieces with yogurt, 10 g salt, turmeric, shahi garam masala, ginger paste, crushed garlic‑green‑chili paste, and a pinch of green cardamom. Mix until the meat is evenly coated, cover and refrigerate.
Time: PT30M
Temperature: 25°C
Prepare the spice paste
Using a mortar‑pestle or the side of a chef’s knife, crush the garlic cloves together with the green chilies into a smooth paste.
Time: PT5M
Heat mustard oil
Place the pot over high heat, add 20 ml mustard oil and heat until it lightly smokes and turns a pale yellow.
Time: PT2M
Temperature: high (≈200°C)
Temper whole spices
Add dried red chilies, bay leaves, big (black) cardamom, black cardamom, cloves and the cinnamon stick. Fry for about 2 minutes until fragrant.
Time: PT2M
Temperature: medium‑high
Caramelise the onions
Add the sliced onions to the pot. Fry, stirring frequently, until they turn a deep, rich brown – about 30 minutes. This slow caramelisation builds the curry’s body.
Time: PT30M
Temperature: medium‑high
Brown the marinated mutton
Increase the heat to high and add the marinated mutton. Stir constantly and brown the pieces for about 15 minutes until they develop a deep mahogany colour.
Time: PT15M
Temperature: high
Add salt and sugar for controlled browning
Sprinkle 8 g salt and 10 g sugar over the meat. Continue to fry for another 10 minutes, stirring often. The sugar helps achieve a glossy, caramelised surface without burning.
Time: PT10M
Temperature: high
Slow simmer with incremental water
Place a 1‑liter jar of hot water nearby. Add roughly 30 ml of hot water to the pot, stir, cover for 1 minute, then uncover and scrape the browned bits from the bottom. Repeat this process over the next 2 hours, adding water in small increments each time, until the meat is dark and the flavors have melded.
Time: PT2H
Temperature: medium
Adjust gravy and finish cooking
Add additional water to reach your desired gravy consistency (usually 200‑300 ml). Cover and simmer on low‑medium heat until the meat is fork‑tender and can be pulled apart with two fingers, about 30 minutes.
Time: PT30M
Temperature: low‑medium
Finish with ghee
Stir in 100 g ghee until fully melted and incorporated. Let the curry rest for 5 minutes before serving.
Time: PT5M
Nutrition Facts
- Calories
- 500
- Protein
- 35 g
- Carbohydrates
- 15 g
- Fat
- 30 g
- Fiber
- 2 g
Dietary info: Gluten‑free, High‑protein, Keto‑friendly (low carb), low-carb, high-protein
Allergens: Dairy (yogurt, ghee), Mustard (mustard oil)
Ingredient Substitutions
- Instead of Mutton (leg pieces with bone): Lamb shoulder
- Instead of Garlic cloves: Garlic paste
- Instead of Ginger paste: Fresh grated ginger
- Instead of Green chilies: Jalapeño, Serrano
- Instead of Plain yogurt: Greek yogurt, Kefir
- Instead of Salt (for marination): Sea salt
- Instead of Turmeric powder: Fresh turmeric
- Instead of Shahi garam masala: Garam masala
- Instead of Kashmiri red chili powder: Paprika + a pinch cayenne
- Instead of Coriander powder: Fresh cilantro (different flavor)
- Instead of Mustard oil: Vegetable oil (flavor will change)
- Instead of Cinnamon stick: Cassia
- Instead of Dried red chilies: Fresh red chilies
- Instead of Sliced onions: Shallots
- Instead of Sugar: Honey
- Instead of Salt (for cooking): Sea salt
- Instead of Ghee (clarified butter): Clarified butter, Unsalted butter
Equipment Needed
- Heavy‑bottomed pot or Dutch oven (5‑6 L)
- Sharp chef’s knife
- Cutting board
- Mixing bowl (for marination)
- Wooden spoon or heat‑proof spatula
- Measuring spoons / scale
- Lid for the pot
- Heat‑proof jar (1 L) for hot water (optional)
Critical Steps — Do Not Skip
- Marinating the mutton with yogurt and spices
- Caramelising the onions for 30 minutes
- Deep browning of the meat with sugar
- Gradual addition of hot water and scraping the fond
Chef Tips from the Video
- Use a heavy‑bottomed pot to prevent scorching during the long caramelisation.
- A splash of tamarind paste at the end adds a subtle tang without extra yogurt.
- Serve with mishti polao or plain basmati rice to balance the richness.
Troubleshooting
Curry tastes bitter
Reduce the high‑heat browning time; ensure sugar is added and the pot is not left unattended.
Gravy is too thick
Add hot water a little at a time while simmering; cover and stir.
Meat is tough
Continue simmering on low heat with a little extra water until the meat pulls apart easily.
Storage
Refrigerator: Store in an airtight container for up to 3 days.
Freezer: Freeze in portions for up to 2 months.
Room temperature: Do not keep at room temperature for more than 2 hours.
Make-Ahead Tips
- Marinate the meat overnight for deeper flavor.
- Caramelised onions can be prepared a day ahead and stored in the fridge.
Last updated: August 24, 2026






