Heat oil in a pressure cooker. Sear lamb on both sides for 5 mins. Set aside in a plate.
In the same cooker, add onions, curry leaves and saute for 2 mins.
Add in ginger garlic paste, salt, turmeric powder, red chilli powder and garam masala powder and mix well.
Add in lamb chops back in along with water. Cover and pressure cook for 3 to 4 whistle.
Once pressure releases, strain the stock and set aside.
Heat a pan, add in oil.
Add in onions , garlic,green chillies and saute for 2 mins.
Add lamb stock, red chilli powder, sweet chilli sauce, soy sauce and vinegar. Bring it to a boil.
Add lamb back in and simmer in the sauce till it thickens and the sauce coats the lamb.