Start by pouring the sugar in a small plate and use one of the lime wedges for wetting the rims of the glasses. Once the glasses are well moistened, dip your glass into the sugar.
In a blender, combine the watermelon, ginger, tequila and ice, and blend until smooth.
Add lime juice and basil to a the glass and muddle the basil.
Pour blended watermelon into a glass and garnish with watermelon wedges basil leaves. Cheers!