Instructions In a food processor or blender, pulse the cucumber, watermelon and cilantro.Strain with a sifter to separate the pulp from the juice. Discard the pulp.Clean the food processor or blender and add the juice to a cocktail shaker with the ice, tequila, lime and agave. Shake vigorously.If rimming the glass, run a piece of lime around the rim. Add a little salt to a plate and run the wet rim through the salt.If serving on the rocks, pour the mixture into the rimed glass over ice.If serving frozen, transfer the mixture from the cocktail shaker into the food processor or blender. Blend to desired your desired consistency, transfer to a rimmed glass and enjoy!