Limoncello is a lemon liqueur. There are many brands of gluten free limoncello, However, when you only need a little bit for a recipe, why waste the money when you can make your own? Here is an easy recipe that just takes a few days to ferment.
Peel off the bright yellow skin from the lemons. (I use a vegetable peeler.) Place in a bowl or other container, which will be filled with vodka soon. set aside. Remove the pith (light yellow portion) and discard. Save the lemons for future uses like making lemonade.
Pour the vodka over the lemon peels and cover with plastic wrap or a lid cocked slightly open. Allow the two to soak for 4 - 5 days. Do not refrigerate.
Make the simple syrup by adding the water and sugar to a saucepan over medium heat. Stir occasionally, until the sugar melts, 4 - 6 minutes. You can simmer it a little longer if you wish to allow some of the water to evaporate, which makes a little more of a syrupy texture.
Pour the simple syrup into the vodka mixture and combine. Cover and allow the mixture to settle at least 8 hours or overnight.
Using a fine mesh strainer, strain the limoncello into another bowl. You can just discard the bottom sediment. Also, discard the lemon peels. Pour the limoncello into a glass bottle and seal. Refrigerate until ready to use, up to a month or two.