In a cocktail shaker add basil leaves, simple syrup and lemon juice.

Using a wooden muddler, crush the basil till bruised and fragrant. You will notice the liquid will start to turn slight green in color.

Pour in gin and ice cubes. Add top to the shaker and give the drink a good shake until the outside of the cocktail shaker is freezing cold. I always know when to stop because it starts to get too cold to hold any longer.

Strain into a short cocktail glass, add additional ice and garnish with basil leave if desired.