Calcutta or Kolkata style Chicken Biryani is a mixed rice dish inspired by Awadhi cuisine. Biryani usually cooked with rice, Yogurt, meat and spices.
This Biryani is much lighter on spices and serving potato with meat is the speciality of Kolkata Biryani. Nutmeg, Mace, Cinnamon, Cardamom, Saffron, rose water, and screwpine water ( Meetha Attar) these are the quintessential ingredients for this Biryani.
One can easily get Screwpine water (Kewda Water) or Meetha Attar in Calcutta or West Bengal, but it really hard to get outside the state. So if you don’t get in your locality, you can skip it. But, adding a few drops of Meetha Attar really make the difference.