1) Puree the watermelon in a blender. Add the lime juice and crushed ice. Blend until smooth.
2) Pour the sugar into a saucer. Run a small wedge of lime around the rim of each glass and dip the rim into the sugar. Carefully divide the watermelon mixture among four glasses and serve with mini fruit skewer garnish.
3) To Make Skewers for Garnish: Thread each half-skewer with 1 watermelon chunk, 1 thin slice lime and 1 grape.
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