A lemon (Citrus × limon) is a small evergreen tree native to Asia.
The tree's ellipsoidal yellow fruit is used for culinary and non-culinary purposes throughout the world, primarily for its juice, though the pulp and rind (zest) are also used in cooking and baking. The juice of the lemon is about 5% to 6% citric acid, giving the fruit its distinctive, sour taste and making it a key ingredient in drinks and foods such as lemonade and lemon meringue pie.
