Kaffir lime (Citrus hystrix) is a citrus fruit native to tropical Southeast Asia and southern China. Unlike common limes, it is primarily valued for its intensely fragrant zest and its glossy, dark green, double-lobed leaves. The fruit itself, while juicy and acidic, is often not eaten raw due to its bitter undertones and numerous seeds, but its juice can be used sparingly in culinary applications.

Beyond culinary uses, Kaffir lime has applications in traditional medicine and aromatherapy. Its essential oils are believed to possess antiseptic and insect-repellent properties. The refreshing and invigorating aroma of the leaves and zest also makes them popular in natural cleaning products and fragrances. Kaffir lime is a vital ingredient that brings an irreplaceable layer of authentic flavor and aroma to a wide range of Southeast Asian dishes.