Marinate Mutton: In a pot, add mutton, yogurt, raw papaya paste, ginger garlic paste, Himalayan pink salt, lemon juice, and 2 tbsp cooking oil. Mix well, cover, and marinate for 30 minutes.
Cook Mutton: Place the pot on medium flame, mix well, cover, and cook until the meat is tender, about 30-40 minutes. Set aside.
Prepare Karahi Base: In a wok (karahi), add 2 tbsp cooking oil and Blue Band margarine. Let it melt.
Cook Onions and Chillies: Add chopped onion and green chilli. Mix well and cook on medium flame for 2-3 minutes.
Add Tomato and Spices: Add pureed tomatoes, roasted and crushed coriander seeds, cumin seeds, and red chilli powder. Mix well, cover, and cook on low flame for 10-12 minutes. Then increase to high flame and cook until oil separates.
Add Cream: Turn off the flame, add cream, and mix well.
Combine Mutton with Sauce: Turn on the flame, add the cooked mutton to the karahi, and mix well.
Final Seasoning and Garnish: Add crushed black pepper, julienned ginger, sliced green chillies, and chopped fresh coriander. Mix well, cover, and cook on low flame for 2-3 minutes.
Serve: Garnish with additional green chilli, ginger, and fresh coriander. Serve hot.