Add coconut rum, lavender simple syrup, and lime juice to a cocktail shaker filled with ice.
Shake vigorously for 10-15 seconds until well chilled.
Double strain into a chilled champagne flute or tall glass filled with fresh ice.
Top with prosecco or sparkling wine and stir gently with a bar spoon.
Garnish with a fresh lavender sprig.
To make lavender simple syrup:
Combine water and sugar in a small pot
Heat until sugar dissolves
Add dried lavender
Simmer for 5 minutes
Remove from heat and steep for 30 minutes
Strain and store in fridge for up to 2 weeks
Notes
The cocktail tastes best when served very cold with fresh ice.Store leftover lavender syrup in an airtight container in the refrigerator.For a non-alcoholic version, replace the rum with coconut water and use sparkling water instead of prosecco.Fresh lime juice works better than bottled for a crisp flavor.