01 - Place the cubed watermelon in a blender and blend until completely smooth, creating a uniform puree.
02 - Pour the puree through a fine-mesh sieve into a large bowl, pressing with a spoon to extract all juice while removing any pulp for a smoother texture.
03 - Add the sugar, lime juice, and salt to the strained watermelon juice. Stir continuously until the sugar is completely dissolved.
04 - Pour the mixture into a shallow, freezer-safe dish and place in the freezer for 30 minutes.
05 - Remove from freezer and stir vigorously with a fork, breaking up any ice crystals that have formed around the edges.
06 - Return to freezer and repeat the stirring process every 30 minutes for approximately 3 hours, until the sorbet reaches a scoopable, fluffy consistency.
07 - Serve immediately for a softer texture, or freeze longer for a firmer consistency. If frozen solid, let sit at room temperature for 5-10 minutes before scooping.