Place mint leaves in the cocktail shaker and gently muddle them.
Add pineapple juice and simple syrup to the shaker.
Fill the shaker with ice and shake for 10-15 seconds until well chilled.
Strain the mixture into a champagne flute or tall glass filled with ice.
Pour in the prosecco slowly to maintain bubbles.
Top with a splash of club soda.
Garnish with a pineapple wedge and fresh mint sprig.
Notes
Store fresh pineapple juice in the fridge for up to 3 days.Make simple syrup by heating equal parts sugar and water until dissolved, then cool before use.For best results, chill all ingredients before mixing.Replace prosecco with sparkling water for a non-alcoholic version.The drink tastes best when served right away while the bubbles are fresh.