Summarize this article in one sentence.
After the chicken is ready it is now time to make the sauce.

Summary:
Marinate the chicken with all of the spices besides the clarified butter. Cook the chicken in the ghee(butter) until it is done. Braise the onion in the butter (just for a while not until gold). Add all of the sauce spices (besides fresh cream) and cook it until the water evaporates  Add the fresh cream and cook the sauce for 2 minutes on low. Add the chicken in the sauce and cook it for 5 minutes. Garnish the Butter Chicken with chopped coriander.