Prep Glass: Fill an Old Fashioned or Rocks glass with ice cubes and give it a quick stir. Set it aside.
Prep Shaker: Place 1 handful of fresh basil leaves into your cocktail shaker.
Add Lemon Juice: Add 1 oz fresh lemon juice into the shaker.
Muddle: Use the muddler to crush the basil leaves. Muddle well to blend the basil and lemon juice flavors and get a bright green color.
Add Simple Syrup: Once you’re done muddling, add ¾ oz simple syrup to the mix.
Add Gin: Finally, pour 2 oz Gin into the shaker.
Shake: Fill the shaker with ice cubes, close it and shake vigorously for about 10-15 seconds.
Strain: Remove the ice in the Old Fashioned glass and refill it with fresh, new ice cubes. Then, using both the cocktail strainer and fine strainer, strain the drink into the ice-filled glass.
Garnish and Serve: Garnish with a basil leaf and serve immediately.