Place a large wide wok/pan on medium-high heat. Add 1/2 cup oil and 2 tablespoons ginger-garlic paste. Saute until it browns slightly, about 1 minute.
Add chicken and saute for 2 minutes or until the chicken changes colour (white with few brown markings).
Immediately add 2 cups of water to the chicken.
Then add the spice bag we prepared in Step 3 and the powdered spices in Step 4.
Stir well, cover the wok and cook for 15-20 minutes, stirring occasionally.
Turn off the heat, remove and discard the spice bag.
The chicken gravy is ready. It will not be dry, there will be about 2 cups of liquid (this will help create the steam for dum). It will also be salty but don't worry.