1 fluid ounce cucumber-flavored syrup
2 slices jalapeno pepper
4 1/2 fluid ounces club soda
1 (1.5 fluid ounce) jigger vodka (such as Devotion®) Pure)
1 splash lime juice
1 cucumber slice
Muddle cucumber-flavored syrup and jalapeno pepper together in a cocktail shaker. Fill the shaker with ice and pour in club soda, vodka, and lime juice. Cover shaker and shake until outside of shaker becomes frosted. Pour cocktail into a glass and garnish with cucumber slice.