How to Make It
In a tall glass, muddle the mint and basil leaves with the simple syrup. Fill the glass with ice. Stir in the gin, Chartreuse and lime juice. Garnish with the cucumber slices, rosemary, mint sprig and a few lime slices.
To make simple syrup: In a microwave-safe bowl, heat 1/4 cup of sugar with 1/4 cup of water on high until the sugar is dissolved.