Rocket Power

Place the arugula leaves in a shaking tin.

Add ice cubes to the tin and shake vigorously for several seconds to bruise the arugula.

Introduce the gin, freshly squeezed lemon juice, simple syrup, and balsamic vinegar into the tin.

Shake the mixture until it is well chilled.

Double strain the cocktail into a chilled Old Fashioned glass over fresh ice.

Garnish with a sprig of fresh arugula.