Place basil leaves in the pitcher and muddle gently to release the oils.
Add the orange juice, lime juice, and lemon juice to the pitcher.
Pour in the simple syrup and stir well.
Add sparkling water just before serving.
Fill glasses with ice cubes.
Pour the mixture into glasses.
Garnish each glass with fresh basil leaves and citrus slices.
Notes
Store citrus juices in the fridge for up to 24 hours before mixing.Make simple syrup by heating equal parts water and sugar until dissolved.Replace regular ice cubes with frozen citrus juice cubes to prevent dilution.Add more or less simple syrup based on taste preferences.This recipe serves 6-8 people.