Add watermelon, juice of 1 lime, basil, and honey to blender.
Blend on high for until all ingredients are well mixed.
Pour into a large pyrex container, cover, and place in freezer.
Every 1-2 hours, check on the granita and mix using a fork to create a slush type consistency. Do this 3-4 times or until desired texture is reached.
Serve with fresh basil on top.
Optional: Can add your liquor of choice before freezing. Tequila, Rum or Gin would go well. I would start with 1-2 ounces and adjust for taste.