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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.