In a medium-size pot, on medium heat, add oil and let it heat up.
Next add onions, sauté it until it's brown.
Then take it out in a bowl, cool it down for few minutes, crush the fried onion with hand, and then set aside.
In the same pot, with some oil left, add black cardamon, cumin seeds, cinnamon, cloves, black peppercorns, and green cardamom.
Sauté for 10 seconds. Now add the ginger garlic paste and let it cook for 30 seconds.
Next add chicken and sauté that for 3 minutes.
Add yogurt and mix well for 2 minutes.
Now add salt, coriander powder, red chili powder, and turmeric powder.
Next add mace and nutmeg mixture that you crushed in a mortar & pestle and mix well.
Let it cook for 10-15 minutes on medium heat or until the chicken is tender.
Now take the browned onion that you crushed, scatter the brown onion across your Korma and Kewra, let it cook for 2 minutes on low-medium heat.
Cover the korma with lid and let it sit for 10 mins.
Open the lid and sprinkle some garam masala powder and ginger.
Enjoy with a Shermaal.