Finely chop the peels of the lemons and steep them in alcohol for a week.
In a bowl, prepare a syrup with the sugar and 150 cl water; let it cool.
Now combine the syrup with the infusion of the lemon peels and alcohol, strain and bottle.
After about 4 months, the liqueur will be ready for consumption.
Notes
For a more aromatic limoncino, you can add a couple of fresh mint leaves to the recipe while infusing the lemon peels in the alcohol. This will give the liqueur an even fresher and more unique flavor.