01 - Fill a copper mug or tall glass with ice cubes to chill the vessel.
02 - Pour the fresh lime juice over the ice in the glass.
03 - Add the ginger beer and club soda to the glass; stir gently with a bar spoon to combine without losing carbonation.
04 - Slap the mint leaves between your palms to release the aromatic oils, then place them in the drink.
05 - Garnish with a lime wedge and fresh ginger slice if desired. Serve immediately while cold.