Add cucumber slices and simple syrup to a cocktail shaker.
Muddle well to release the fresh cucumber flavor.
Add lime juice, gin, and a handful of ice.
Shake until chilled.
Strain into your glass and garnish with a cucumber slice.
Notes
If you love things extra zesty, add a tiny splash of soda or use a citrus-forward gin. You can also chill your glass beforehand for that frosted finish.