Add gin or vodka, simple syrup, and fresh lime juice to an ice-filled cocktail shaker. Shake and strain into a stemmed cocktail glass (straight up) or a rocks glass filled with ice.
Garnish with fresh lime wedge and mint, if desired
How to Make Simple Syrup:Combine equal parts water and sugar and heat either on the stove or in the microwave until sugar is completely dissolved and the mixture is no longer cloudy. Cool before using.