# Kosha Mangsho A rich Bengali-style slow-cooked mutton curry known for its dark brown color and intense flavors. # Preparation Time - Prep: 30 mins (plus overnight marination) - Cook: 60 mins - Total: 90 mins (plus marination time) # Ingredients ## For the Dish - 1 kg mutton - 500g onions, sliced - 2-inch ginger - 8-10 garlic cloves - 1.5 large tomatoes - 6-8 green chillies - 4 large potatoes - 1 cup plain yogurt - Salt to taste - Mustard oil as needed - 2 tsp sugar ## Spices - 1 tsp black pepper powder - 1.5 tsp garam masala powder - 2-4 whole dry red chillies - 1-inch cinnamon stick - 5-6 cloves - 1 tsp turmeric powder - 1 tsp red chilli powder - 1 tbsp ghee (for finishing) # Instructions 1. Marination: - Mix mutton with yogurt, some mustard oil, and 1/2 tsp turmeric powder - Marinate overnight in refrigerator 2. Preparation: - Slice onions - Cube tomatoes - Cut potatoes in halves - Make paste of green chillies, ginger, and garlic - Puree tomatoes 3. Cooking: - Heat mustard oil in pressure cooker - Add sliced onions with sugar and salt - Add whole garam masala and dry red chillies - Add black pepper powder - Cook until onions brown - Add chilli-ginger-garlic paste, cook 4-5 minutes - Remove mixture, grind to paste, let cool 4. Main Dish: - Heat more mustard oil, fry potato halves for 4 minutes - Add marinated mutton, fry on high heat - Add onion paste, tomato puree, garam masala powder - Add remaining turmeric and red chilli powder - Cook (koshano) for 10-15 minutes on medium-high heat - Remove potatoes to prevent mashing - Add 2 cups water - Pressure cook for 3-4 whistles or 10 mins on high flame 5. Finishing: - Once pressure releases, check seasoning - Add potatoes back - Cook on low flame 15-20 minutes to reduce gravy - Finish with 1 tbsp ghee # Notes - Overnight marination is essential for tender meat - 'Koshano' (slow cooking) is crucial for developing flavors - Use mustard oil for authentic taste - Don't skip the final ghee addition - Can be served with paratha, roti, or steamed rice - Adjust spice levels to taste