Wash the lemons well and peel the yellow part off of them using a vegetable peeler.

Divide the peels between 2 jars.

Pour vodka over the lemon peels in the jars, dividing the vodka evenly.

Seal the jar tightly and let the jars sit on the counter, out of direct sunlight for at least 4 days but up to a month.

Gently shake the jars every other day or so.

After the lemons have soaked, whisk together 1 cup of sugar and 1 cup of water in a small saucepan set over medium low heat.

Cook the mixture until the sugar has dissolved stirring constantly.

Set a mesh strainer over a bowl and pour the lemon liqueur into the bowl so the strainer catches the lemon peels.

Discard the peels.

Whisk in the simple syrup.

Give the limoncello a taste. If it isn't sweet enough or too strong of an alcohol taste, make another batch of simple syrup with the remaining sugar and water and whisk it in to the liqueur.

Serve and enjoy or store!