Add mint leaves and simple syrup to the cocktail shaker.
Muddle the mint gently to release the oils.
Pour in the pomegranate juice and vodka.
Fill the shaker with ice and shake for 10-15 seconds.
Strain the mixture into a highball glass filled with fresh ice.
Top with sparkling water and stir gently.
Garnish with pomegranate seeds and a mint sprig.
Notes
The cocktail can be made non-alcoholic by skipping the vodka and adding extra sparkling water.Fresh pomegranate juice works best, but store-bought juice is a good substitute.Make simple syrup by combining equal parts sugar and water in a pot. Heat until sugar dissolves, then cool before using.Store leftover simple syrup in an airtight container in the fridge for up to 2 weeks.