Put the frozen cherries, crushed ice, mint leaves, lime juice, rum, and simple syrup in a blender. Blend until smooth.
Pour the mixture into chilled glasses and top with crushed ice. Garnish with lime wedges and cherries.
In a small saucepan, over medium heat, combine the sugar, water, and lime zest. Bring to a boil, then reduce the heat and simmer for 5 minutes, stirring occasionally, until the sugar has dissolved. Remove the pan from the heat and allow the syrup to cool for 20 minutes. Strain before using.
Recipe courtesy of Giada De Laurentiis