Muddle cucumber slices in a cocktail shaker until they release their juice.
Add gin, lime juice, and simple syrup to the shaker.
Fill the shaker with ice and shake for 15 seconds.
Strain the mixture into a highball glass filled with fresh ice.
Top with club soda and stir gently.
Garnish with a cucumber ribbon and lime wheel.
Notes
The drink stays fresh for up to 2 hours when refrigerated.Fresh cucumber and lime juice make a big difference in taste compared to bottled ingredients.Store leftover simple syrup in the fridge for up to 2 weeks.For a stronger cucumber taste, let the muddled cucumbers sit in gin for 30 minutes before mixing.Use English cucumbers for fewer seeds and a cleaner taste.