A leaf from an evergreen citrus called the kaffir or makrut lime. While the fruit and zest of the kaffir have plenty of flavor, the leaves are the most prized for their floral scent that straddles the line between lemon and lime. The leaves are generally inedible and, like lemongrass stalks or cinnamon sticks, are fished out of soups and curries before serving. However, finely sliced fresh leaves can be used for garnish.
The kaffir lime leaf is essential to Thai curries and soups, but many dishes can benefit from their flavor. Fry in a bit of oil for a fragrant kaffir oil to be used to finish salads or soups. Kaffir lime leaves can also be steeped in milk that can then be used in fragrant puddings and custards.
