Select a perfectly ripe watermelon, dice into small cubes, and ensure to remove any seeds.

In a high-powered blender, combine the diced watermelon with a can of creamy coconut milk. Add lemon or lime juice if desired, and blend until smooth.

Pour the mixture into a shallow baking dish, cover tightly with plastic wrap, and freeze for 4-6 hours until solid.

Cut the frozen mixture into cubes, transfer back to the blender, and blend until silky smooth.

Pour the mixture back into the baking dish, cover with plastic wrap, and freeze for an additional 1-2 hours.