Step 1.
- Muddle fresh cucumber slices with lime juice in a cocktail shaker.
Step 2.
- Add the gin, simple syrup, and pepper bitters to the shaker with ice.
Step 3.
- Shake well until chilled.
Step 4.
- Strain into a highball glass filled with ice.
Step 5.
- Top with soda water and gently stir.
Step 6.
- Garnish with cucumber slices and a sprig of mint.