Kolkata Biryani, also known as Calcutta Biryani, is a unique biryani recipe that originated in the city of Kolkata in India. It is made with basmati rice, meat (usually chicken or mutton), and a blend of spices that includes a hint of sweetness. The meat is marinated in a mixture of yogurt and spices, then cooked with partially cooked rice in layers. Kolkata Biryani is known for its distinct flavor, which comes from the use of potatoes and a special spice blend called 'Biryani Masala'. The dish is often garnished with fried onions, boiled eggs, and raisins.