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Limoncello (Italian pronunciation: [limonˈtʃɛllo]) is an Italian lemon liqueur mainly produced in Southern Italy, especially in the region around the Gulf of Naples, the Sorrentine Peninsula and the coast of Amalfi and islands of Procida, Ischia and Capri. It is also produced in Puglia, Sicily, Sardinia, Menton in France, and the Maltese island of Gozo. Even though there is debate about the exact origin of the drink, it is at least one hundred years old.
Traditionally, it is made from the zest of Femminello St. Teresa lemons, also known as Sorrento lemons or Sfusato Lemons. Lemon zest, or peels without the pith, is steeped in rectified spirit, high-proof vodka, or other strong, clear spirit made from grain until the oil is released. The resulting yellow liquid is then mixed with simple syrup and perhaps some extra water to achieve the desired strength. Clarity and viscosity are affected by factors such as the relative temperatures of the two liquids. Opaque limoncellos are the result of spontaneous emulsification (otherwise known as the Ouzo Effect) of the sugar syrup and extracted lemon oils.
Limoncello is the second most popular liqueur in Italy  and it has recently become popular in other parts of the world. Restaurants in the United States, Canada, the United Kingdom, Australia, and New Zealand are now increasingly offering limoncello on their beverage and dessert menus.
The United States has seen a rise in commercial producers using California lemons which are grown year around, with 90% of the United States lemon crops coming from California. Limoncello happens to be a popular ingredient in cocktails. Limoncello imparts a strong lemon flavor without the sourness or bitterness of pure lemon juice.
Limoncello is traditionally served chilled as an after-dinner digestivo. Along the Amalfi Coast, it is usually served in small ceramic glasses that are also chilled. This tradition has been carried into other parts of Italy.
An ethanol content of 28-32% is considered optimal for Limoncello.