Carefully peel the lemons, removing only the zest and avoiding the white pith.

Place the lemon peels in a large glass jar.

Pour the vodka over the lemon peels in the jar.

Seal the jar tightly and store in a cool, dark place away from sunlight for at least 3 months, preferably longer.

Prepare a simple syrup by combining equal parts water and sugar in a saucepan.

Heat the mixture over medium heat, stirring until the sugar is completely dissolved.

Allow the simple syrup to cool completely.

After the lemon peel and vodka mixture has steeped for the desired time, pour the cooled simple syrup into the jar.

Seal the jar again and let the mixture sit for another week or two.

Strain the limoncello through a fine-mesh sieve or cheesecloth to remove the lemon peels.

Squeeze the lemon peels to extract any remaining flavor.

Transfer the strained limoncello to bottles.

Store the bottled limoncello in the freezer for serving.