Lime is a term referring to a citrus fruit which is typically round, green to yellow in colour, 36 cm in diameter, and containing sour and acidic pulp. Limes are a good source of vitamin C, and are often used to accent the flavours of foods and beverages. They are grown all year round and are usually smaller and less sour than lemons. In cooking, lime is valued both for the acidity of its juice and the floral aroma of its zest. It is a very common ingredient in authentic Mexican, Vietnamese and Thai dishes. It is also used for its pickling properties in ceviche. Lime leaves are also an herb in South, East, and Southeast Asia. Lime is frequently used to add flavour to cold and hot drinks, including water, tonic and other cocktails