Add passionfruit pulp and simple syrup to a cocktail shaker.
Fill the shaker with ice and shake for 15 seconds.
Strain the mixture through a fine-mesh strainer into champagne flutes, filling each glass about 1/3 full.
Top each glass slowly with chilled champagne.
Stir gently with a small spoon to combine.
Garnish with fresh passionfruit seeds.
Notes
The cocktail works best with brut champagne since the passionfruit adds natural sweetness.Store any leftover passionfruit pulp in an airtight container in the fridge for up to 3 days.For a non-alcoholic version, replace champagne with sparkling water or ginger ale.Make sure all ingredients are well-chilled before mixing for the best results.Double strain the passionfruit pulp if you prefer a smoother texture without seeds.