The juice of the lemon is composed of about 5% citric acid, with a pH of around 2.2, giving it a sour flavor profile. Its distinctive taste makes lemon juice a key ingredient in food and beverages. Lemons were commercially grown first in Europe, in Genoa, in the 15th century and then introduced into the Americas by Christopher Columbus. Spanish conquest throughout the New World helped spread lemon seeds. In the 19th century, lemons were increasingly planted in Florida and California. You cannot have a complete, handcrafted cocktail program without it.