Limoncello is an Italian liqueur made from lemons, vodka, water and sugar. Making limoncello is a simple process, but takes about five days to make due to steeping time. Limoncello is traditionally made in southern Italy around the area of Naples.
To make limoncello, peel 10 lemons in long strips. You do not need the rest of the lemons for this recipe, but can use them for something else. Peel away the white pith from the undersides of the lemon peels with a sharp knife. Once the lemon peels are prepped, place them in a large pitcher. Pour one 750 milliliter bottle of vodka over the peels, and cover the pitcher with plastic wrap. Allow the mixture to sit at room temperature for four days.
After the lemons and vodka have steeped, stir 3 1/2 cups of water and 2 1/2 cups of sugar in a large saucepan over medium heat until the sugar dissolves. Pour the sugar mixture into the pitcher, cover with the plastic wrap, and let it sit overnight at room temperature. The final step is straining the limoncello through a strainer or cheese cloth, discarding the peels and bottling the liquid. Store the bottles in the refrigerator for up to one month.