How to Make It
Simmer water with basil leaves until reduced to 2 1/2 tablespoons. Strain, then stir in light brown sugar and 1 teaspoon fresh lime juice. In a shaker half-filled with ice, combine the basil-lime syrup with light rum and 1/2 ounce fresh lime juice; shake. Strain into a chilled martini glass and garnish with basil and lime.