Watermelon Mint Smoothie

This smoothie will help you cool down on these hot summer days!!
2 cups, tightly packed, diced seedless watermelon 1 tablespoon fresh mint leaves 1 teaspoon sugar, agave syrup or vanilla sugar 3 to 4 ice cubes (more to taste) Watermelon balls for garnish 1. Place all of the ingredients except the watermelon balls in the blender. Blend until frothy, about one minute. Pour into a glass, and garnish with watermelon balls. Serve right away.