Kolkata Biryani, also known as Calcutta Biryani, is a famous variation of biryani that originated in the city of Kolkata, in the eastern part of India. It is made with basmati rice, meat (usually chicken or mutton), and a unique blend of spices. The rice is cooked separately with spices like cinnamon, cardamom, and bay leaves, while the meat is cooked separately with a special blend of spices. The two are then layered together and cooked on low heat, allowing the flavors to meld together. Kolkata Biryani is known for its distinct aroma and flavor.