Prepare the Passionfruit: Cut two passionfruits in half. Scoop out the pulp and seeds into a small bowl. This will give your mocktail that authentic tropical feel.

Mix the Base: In a cocktail shaker, combine the passionfruit puree or juice, vanilla syrup, and fresh lime juice. Add a generous handful of ice cubes.

Shake It Up: Seal the shaker and give it a good, vigorous shake for about 15-20 seconds. This helps to blend all the flavors while chilling the liquid.

Strain and Pour: Strain the mix into a coupe or martini glass, leaving room at the top for the sparkling water.

Top with Fizz: Gently pour in the sparkling water to give the drink its light, bubbly finish.

Garnish and Serve: Garnish with a halved passionfruit or a sprig of mint for that wow factor. Serve immediately and enjoy!