Heat 2 tbsp oil in a pressure pan and shallow-fry the marinated mutton pieces for 6-7 mins on medium flame till half-done.Take the mutton pieces and keep it aside.
Heat 2 tsp ghee in the remaining oil,saute the chopped onions and curry leaves(optional) till it turns golden brown.
Add jeera powder, shahjeera seeds and chopped tomatoes with 1 tsp salt(adding salt here speed-up the cooking of tomatoes) and saute this till the tomatoes begin to melt.
Add ginger paste and garlic paste,saute this till the rawness goes.
Then add green chillies,coriander powder and chilli powder and saute well for 2 mins.
Now add the cashewnut masala and saute for 3 more mins.
Add the shallow-fried mutton pieces and stir for 10 more mins.
Then, add 150 ml water and the coriander leaves.Mix this well.Pressure-cook this upto 2 whistles.Turn off the flame.Leave this for-a-while till the pressure releases.
Garnish with few coriander leaves.Serve this tasty mutton curry hot with rice or Indian breads.