Instructions

1. 1
   In a shaker, muddle the mint, lime juice and simple syrup.
2. 2
   Add the gin and fill with ice.
3. 3
   Shake, and strain into a highball glass filled with crushed ice.
4. 4
   Stir until frost appears on the outside of the glass.
5. 5
   Fill with club soda and garnish with another mint sprig.