Step 1

Cut the rind off the watermelon and cut watermelon into chunks.

Step 2

Freeze half of the chunks until frozen, 1-2 hours, and refrigerate the other half.

Step 3

Add the frozen and refrigerated watermelon to a blender and blend until it reaches a slushie texture. You may need to add a little bit of water to the blender to get things going. Garnish with cilantro or mint, if desired.