Heat 3 tbsp refined oil in a pressure cooker/ heavy bottomed pan.
Add the sliced onions & fry on medium heat for 10 mins till golden.
Now add the mutton pieces, mix and sear/bhunno the mutton on medium heat for 5 mins by adding splashes of water.
Add the ginger garlic paste, mix and fry for 2 mins on low heat.
Now add the turmeric & Kashmiri Chilli powder, mix and bhunno for 5 mins on medium heat by adding splashes of water. Bhunno till the mutton is browned and oil separates.
Add 200 ml of water & pressure cook for 4 whistles till mutton is tender. Alternatively, continue to cook covered in the pan for 45 mins till meat is tender.
Once the pressure is released, open the lid & transfer to a pan/kadai. Mix 3 tbsp of whisked curd/ yogurt , add the green chillies and continue to cook on low heat for 2-3 mins till the yogurt is cooked. Continue to cook on medium heat to dry any excess water that is there.
Add 3 tsp of the ground bhuna masala powder, mix well and fry on medium heat for 3-4 mins.
Garnish with chopped coriander leaves.
Continue to bhuno the meat for 2-3 mins on medium heat till dry.
Serve with naan or rice