The classic Cuban mojito cocktail is the inspiration for this ruby-hued watermelon version. Be sure to keep the limeade frozen so the beverage will be slushy.
Arrange watermelon in a single layer on a baking sheet; freeze 2 hours or until completely frozen.
Combine frozen watermelon, sparkling water, rum, mint, and limeade in a blender; process until smooth. Garnish with mint sprigs and lime slices, if desired. Serve immediately.
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