Prepare the cantaloupe: Cut the melon in half, remove seeds, and cut into 1-inch chunks.
Muddle the fruit: Place cantaloupe chunks in the cocktail shaker and muddle thoroughly until the fruit is broken down and juicy.
Add the mixers: Pour in vodka (or rum), lime juice, and simple syrup.
Add ice to the shaker.
Shake well: Close the shaker and shake vigorously for 15-20 seconds until well chilled.
Strain the mixture: Pour through a fine mesh strainer into ice-filled glasses, filling them halfway.
Top with bubbles: Add prosecco or sparkling wine to fill each glass.
Stir gently with a bar spoon.
Garnish: Add a sprig of mint and a small cantaloupe ball on a cocktail pick.