Place the watermelon, lime juice and zest, sugar, salt and ice in a blender. Blend until you have a slushy consistency and the mixture is cold and frozen. You can taste and add more sugar if desired.
Pour it into glasses and top with a sprinkle of freshly grated lime zest. Add in a lime wedge and watermelon slice. Serve immediately.
Course: Drinks
Cuisine: American
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