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Place the mint leaves in a martini shaker or small bowl.
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Add the sugar, cranberries, and lime juice.
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Muddle together (squish and press) with a wooden spoon for a few seconds to release juice and oils from min leaves.
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Add ice to the shaker, pour in rum.
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Shake, shake, shake, shake it like a Polaroid picture.
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Pour into a high ball glass and top up with Perrier.
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Delish!