Pinch raw quinine powder (order online at raintreenutrition.com)
Large ice cubes
2¼ ounces sparkling water (preferably Welsh)
1½ ounces fresh lime juice
Lime wedge
Directions
In a cocktail shaker, combine the gin, Key lime juice, simple syrup and quinine powder and dry-shake. In a Collins glass, add the large ice cubes. Strain the gin mixture over the ice and top with the sparkling water. Stir once with a barspoon. Top with the regular lime juice, garnish with the lime wedge and serve.