Mixing sweetapricot nectar with tart limejuice makes this rum coolerextra refreshing.
In a food processor, pulse lime zest with the sugar until finely ground. Measure out 1/4 cup mixture; transfer the rest to a shallow dish. Pour 2 tablespoons lime juice into another dish. Dip rims of four glasses in juice, then in sugar mixture, coating well.
In a blender, puree apricot nectar, rum, remaining 1/4 cup lime juice, reserved zest 1/4 cup mixture, and 2 cups ice. Divide among prepared glasses, and serve immediately.