Step 1.
- Muddle the fresh basil leaves in the bottom of a shaker to release their oils.
Step 2.
- Add the tequila, fresh lime juice, and simple syrup into the shaker with the muddled basil.
Step 3.
- Fill the shaker with ice and shake vigorously for about 15 seconds.
Step 4.
- Strain the mixture into a highball glass filled with ice.
Step 5.
- Top with club soda for a refreshing finish.
Step 6.
- Garnish with a sprig of basil.