Lemon

Lemon is a small, egg-shaped, edible citrus fruit with a yellow rind and a juicy, sour pulp, rich in ascorbic acid.The leading acid citrus fruit, because of its very appealing color, odor and flavor, Several lemon-like fruits are domestically or commercially regarded as lemons wherever they are grown and, accordingly, must be discussed under this heading. These include: Rough lemon (C. jambhiri Lush.), Sweet lemon (C. limetta Risso), Meyer (lemon X mandarin hybrid); Perrine (lime X lemon hybrid); Ponderosa (presumed lemon X citron hybrid), qq.v. under Varieties.

Slices of lemon are served as a garnish on fish or meat or with iced or hot tea, to be squeezed for the flavorful juice. In Colombia, lemon soup is made by adding slices of lemon to dry bread roll that has been sauted in shortening until soft and then sieved. Sugar and a cup of are added and the mixture brought to a boil, and then served. 
Lemon juice, fresh, canned, concentrated and frozen, or dehydrated and powdered, is primarily used for lemonade, in carbonated beverages, or other drinks. It is also used for making pies and tarts, as a flavoring for cakes, cookies, cake icings, puddings, sherbet, confectionery, preserves and pharmaceutical products. A few drops of lemon juice, added to cream before whipping, gives stability to the whipped cream. 
Lemon peel can be candied at home and is preserved in brine and supplied to manufacturers of confectionery and baked goods. It is the source of lemon oil, pectin and citric acid. Lemon oil, often with terpenes and sesquiterpenes removed, is added to frozen or otherwise processed lemon juice to enrich the flavor. It is much employed as a flavoring for hard candies.