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What you'll need:
3 cups of cubed watermelon*
1 cup of ice
1 lime (optional)
*Note: Alternatively, you can freeze your cubed watermelon and omit the ice. However, you'll need to add a couple tablespoons of water for smooth blending.
Directions: Blend all ingredients until you reach a slushie consistency. For a thinner, smoother slushie, add water. For a thicker slushie, add ice.