Prepare Mutton: Remove fat layer from mutton leg and make deep cuts with a knife.
First Marination: In a dish, place mutton leg, add raw papaya paste, ginger garlic paste, pink salt, lemon juice and rub well on both sides. Cover with cling film and marinate for 30 minutes.
Prepare Marinade: In a bowl, mix yogurt, green chilli paste, cream, Kashmiri red chilli powder, coriander powder, dried oregano, roasted cumin seeds, red chilli powder, turmeric powder, carom powder, black pepper powder, garam masala powder, and ghee.
Second Marination: Apply the prepared marinade evenly over the marinated mutton leg. Cover with cling film and marinate for 2 hours in the refrigerator.
Pressure Cook: In a pressure cooker, add sliced onions, garlic cloves, marinated mutton leg, fresh coriander, mint leaves, water, and garlic bulb. Cover and pressure cook on medium flame for 1 hour.
Prepare Gravy: Remove mutton leg and garlic bulb from the cooker and set aside. Transfer the gravy to a saucepan and blend well. Heat the gravy, add pink salt and red chilli powder, mix well and bring to a boil.
Finish Gravy: Turn off the flame, add Olper’s cream and whisk well. Add chopped fresh coriander and mix.
Serve: Serve the mutton leg with the garlic bulb and creamy spiced gravy.