Prosecco, Champagne's lively Italian cousin, paired with tart limoncello liqueur makes a great cocktail -- and an even better dessert.
Sprinkle gelatin over cold water in a small bowl. Let stand until softened, about 5 minutes.
Heat Prosecco, limoncello, sparkling water, and sugar in a medium saucepan over medium heat, whisking occasionally, until sugar dissolves. Add lemon juice and softened gelatin, and whisk until gelatin dissolves.
Pour mixture into an 8-inch square baking dish. Refrigerate until set, at least 45 minutes (or overnight). Cut into 4 portions, and garnish with lemon slices and mint.
This dessert tastes best when made a day in advance, which allows the bold citrus flavor to mellow slightly.