Using a high-speed blender, combine the watermelon, strawberries, lemon juice, water, honey, and mint. Blend until well combined. The mixture will be a liquid. Use a strainer or cheesecloth to remove any seeds in necessary.
Pour in the crushed ice and blend for 10-20 seconds and until well mixed.
Drink immediately and with watermelon slice and mint for garnish.
Notes
All nutritional information are estimations and will vary. Estimations do not include optional ingredients.