Pressure cooker method:
Heat oil in the pressure cooker on medium high heat and add the chicken pieces. Fry for a minute. Add the ground paste, mix, place the lid, turn the heat to low and cook till you hear 2 whistles.
Slow cooker method:
Heat oil in a pan on medium high heat and add the chicken pieces. Fry for a minute. Transfer the contents of the pan (chicken + oil) to the slow cooker. Add the ground herbs. Cover and let it cook depending on the settings on your slow cooker.