1 part limoncello
1/2 to 1 part sparkling water (depending on how strong you want it)
Juice of 1 lemon
Fresh mint sprigs
Lemon slices for garnish
Mash a few mint leaves with a wooden spoon in the bottom of a pitcher. Add limoncello and sparkling water and mix. Add more water or limoncello to reach your desired strength. Garnish with more mint leaves and/or lemon slices. Giada de Laurentiis has a recipe where she adds fresh blueberries; throw some in if you have them.