Step 1

Squeeze the yuzu directly into the cocktail shaker (helps capture the most oils from the zest). Add a 1/4 of the squeezed rind into the shaker. Add the gin, vanilla extract (optional), simple syrup, and optional bitters to the cocktail shaker. Add ice & shake for 15-20 seconds.

Step 2

Place ice into an old-fashion glass, strain the cocktail over the ice, top with club soda, and gently stir. Garnish if desired.