Make a smooth paste of all the ingredients listed under the paste using water and keep it aside.
Make a rough paste of onion, garlic and red chillies.
Heat the groundnut oil in a wok and add the onion paste. Fry till its cooked and the rawness is gone. This should take about 5-7 minutes on medium flame.
Add in the green paste and cook it for 10-15 minutes till it reduced and completely cooked and you see oil coming out from sides.
Season it with salt and toasted sesame oil.
By this time your chicken should be grilled, if you want you can add the grilled chicken in the gravy and cook it for 3-5 minutes.
I live to serve the chicken and gravy on the side with rice or flatbreads.