Fill a cocktail shaker with ice. Add the gin, fresh lemon juice, and simple syrup.

Shake vigorously for about 15 seconds until well-chilled and combined.

Fill a tall Collins glass with fresh ice. Strain the shaken mixture into the glass.

Top with club soda (about 2-3 oz) and gently stir with a bar spoon to combine without losing carbonation.

Garnish with a lemon wheel on the rim and a maraschino cherry. Serve immediately.