Kaffir lime leaves are a fragrant and flavorful herb commonly used in Southeast Asian cuisine. These dark green, glossy leaves come from the Kaffir lime tree and have a unique citrusy aroma with a hint of floral notes. They are often used in curries, soups, stir-fries, and marinades to add a bright and zesty flavor. Kaffir lime leaves are typically used whole and are removed before serving as they can be quite tough and fibrous. Their distinct flavor profile can elevate dishes and provide a refreshing and aromatic touch to various recipes.