What are some popular variations of biryani and how are they traditionally prepared?

Some popular variations of biryani include Hyderabadi biryani, Lucknowi biryani, and Kolkata biryani. These variations are traditionally prepared by layering marinated meat, rice, and aromatic spices in a pot, then cooking them together on low heat until the flavors meld together. Each variation has its own unique blend of spices and cooking techniques that give it a distinct taste.