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Limoncello is a classic Italian digestif from Southern Italy made by macerating lemon peels in alcohol for up to a month, then adding it to sugar water. For this quick version, I use Lemon Vodka made in a whipping siphon. The final product is a little less rounded than the original, but it's a great substitute if you have a hankering for limoncello and don't want to wait several weeks.
Feel free to alter the amount of sugar and water you add to account for your taste. Some people prefer a sweeter limoncello and others like it dryer.
Stir or blend the Lemon Vodka and simple syrup together and let sit overnight for the flavors to meld. It is now ready to use or can be stored in the refrigerator for several weeks.