Fill a glass (or glasses) with frozen plastic reusable ice cubes, or use regular ice cubes. Add dehydrated citrus slices or a fresh slice of lemon.
Pour 3 ounces of chilled limoncello into the glass.
Add 3 ounces of Prosecco and 2 ounces of club soda (or your favorite sparkling beverage) and give it a quick stir.
Optional: Garnish with an additional lemon slice or a sprig of mint.
Notes
Not everyone has the same preferences. Now that you know the main ingredients required to make a Limoncello Spritz, play around with the measurements to suit your personal taste.
For a sweeter drink add sprite or your favorite soda. If you don't like your drinks too sweet, use club soda instead.
If you need to seal the champagne bottle until needed next time, a bottle plug sealer comes in handy.