The preparation of homemade Limoncello begins with treating the lemons. Wash all the lemons thoroughly using a metal sponge to remove all impurities, then dry and peel only the yellow part of the lemon using a vegetable peeler, leaving the white part on the lemon, so that the liqueur won't be bitter.
Put the lemon peels in a glass jar with an airtight lid and let them macerate in the alcohol for 3-7 days in a cool, dry place, away from light and heat sources (3 days for an alcohol content of about 20% vol, 7 days for an alcohol content of about 32% vol.). Shake the jar every day to stimulate maceration and mix the ingredients well.
After about a week of maceration, filter the liquid with a strainer and then prepare the syrup by boiling water and sugar in a saucepan. While waiting for it to boil, stir with a wooden spatula to dissolve the sugar evenly. When the sugar has dissolved, the syrup is ready, and let it cool.
When the syrup is cold, add the flavored liquid with lemon peels, then mix well and pour into one or more sterilized glass bottles with an airtight seal. Your homemade Limoncello is ready!