To a Cazuela or punch bowl add sugar and lime juice, stir to dissolve sugar. Pour in fresh watermelon juice, cucumber juice, stir to combine. Stir in tequila, add ice and garnish Cazuela with watermelon and cucumber slices. Run a lime wedge around rim of glass and dip into salt. Serve in cocktail glasses rimmed with salt and filled with ice.
Serves 8-10