3 cups chopped seedless watermelon (6 lbs)
1/2 cup freshly squeezed lime juice (about 4)
2 to 4 Tbs sugar (Depends on how sweet the watermelon is.)
1/2 cup vodka (Optional, just add more watermelon and a tad bit more lime juice.)
Working in batches, puree watermelon in blender with lime juice until smooth. Add sugar, and blend to combine. Add in vodka, and serve with ice and mint leaves.