Giada De Laurentiis has a highly rated limoncello recipe, with 4.5 stars out of 5 stars on FoodNetwork.com. To make this recipe, gather 10 lemons, one 750-millimeter bottle of vodka, 3 1/2 cups of water and 2 1/2 cups of sugar.
Start by taking each lemon and removing the peel in long strips with a vegetable peeler. Do not use the lemons for this recipe, but keep them for other purposes. Using a sharp knife, begin to peel the pith from the lemon peels, and then throw the pith away. Place the peels in a 2-quart pitcher, then pour the entire bottle of vodka over the peels. Cover the pitcher with plastic wrap and set aside at room temperature for four days.
After four days, place the sugar and water in a large saucepan and cook over medium heat for about five minutes. Dissolve the sugar completely before removing the saucepan from the heat and allowing it to cool. When cooled, pour the sugar syrup into the vodka mixture. Cover the limoncello, and allow it to sit overnight at room temperature. The next day, strain the limoncello through a strainer to remove the peels.
Throw the peels in the trash, and transfer the limoncello to bottles. Seal each bottle and refrigerate them for about four hours before drinking. When refrigerated, the limoncello lasts for about a month.