"Kaffir limes is the common name of Citrus hystrix, a tropical fruit that is native to various parts of Asia, including Indonesia, Thailand, and the Philippines. Aside from its many culinary uses, due to its uniquely tart and pleasant flavor, kaffir lime is also highly respected in herbal medicine, due to its high content of beneficial organic compounds that can positively affect the body’s systems. The oil, leaves, fruit, and rind of kaffir limes are all utilized for different purposes. You’ll often find kaffir limes being used in soups and sauces, such as Tom Yum soup, particularly the leaves, which are frequently utilized in Thai cooking. The leaves and rind are so powerful, however, that they can often overwhelm the flavor of the dish. "