Thai dishes use a wide variety of herbs, spices and leaves rarely found in the West, such as kaffir lime leaves (bai makrut).... The characteristic flavor of kaffir lime leaves appears in nearly every Thai soup (e.g., the hot and sour Tom yam) or curry from the southern and central areas of Thailand. The Thai lime (manao) is smaller, darker and sweeter than the kaffir lime, which has a rough...