The lemon is a small evergreen tree native to Asia, and the
tree's ellipsoidal yellow fruit. The fruit is used for culinary and
non-culinary purposes throughout the world, primarily for its juice, though the
pulp and rind are also used in cooking and baking. The juice of the lemon is
about 5% to 6% citric acid, which gives lemons a sour taste. The distinctive
sour taste of lemon juice makes it a key ingredient in drinks and foods such as
lemonade.
