Put bone part and wings of chicken in pressure cooker with enough water, make a pouch with a gauze piece with all spices mentioned in ingredients for "Spices for Pouch" section. Cook fro 15 to 20 minutes under pressure
When stock is ready, strain the stock
Fry sliced onions in oil, blend them with water
Heat some oil and fry ginger, garlic, 2-3 whole red chilies. Add boneless thigh pieces and fry them a little
Add blended onions to it
Add all spices mentioned in ingredients "For Gravy" section except flour and green chilies. Fry till the mixture gives off oil
Add strained chicken stock and some more water if needed
Turn the heat to lowest possible level.
Cook for 2 to 3 hours till the meat is tender
Add flour mixture to it while stirring.
Add chili and cumin mixture
Cook little till the gravy thickens according to requirement