Step 1.
- Muddle fresh raspberries and mint leaves in a shaker to release their flavors.
Step 2.
- Add gin, lemon juice, and simple syrup into the shaker with ice.
Step 3.
- Shake well until chilled.
Step 4.
- Strain into a highball glass filled with crushed ice.
Step 5.
- Top with soda water and stir gently.
Step 6.
- Garnish with additional raspberries and a sprig of mint.