Place 3-4 mint leaves in cocktail shaker. Add lemon juice, simple syrup, and gin.
Fill up shaker with ice. Close shaker and shake hard. Shaker will get cold... keep shaking! This will break up the mint and ice.
Remove top from strainer section of shaker, or remove whole top and use the strainer, pour into cocktail glass. Garnish cocktail with 1 mint leaf (slap it between your hands to release flavor).
*** Note - the large side of my jigger is 1 oz, but not all are the same
*** To make simple syrup, bring 1 cup water and 1 cup sugar to a boil and mix until dissovled. Let cool
Recipe by One Green Fork at https://www.onegreenfork.com/southside-gin-cocktail/