Begin by cutting a ripe watermelon into roughly 1-inch cubes, ensuring they are uniform for even freezing. Spread the cubes in a single layer on a parchment-lined baking sheet. Freeze these for at least 6 hours, or until solid.

Once your watermelon is fully frozen, gather your ingredients. In a high-speed blender, combine the frozen watermelon cubes, freshly squeezed lime juice, coconut water, and a pinch of sea salt for enhanced flavor. If you desire extra sweetness, add agave nectar, and toss in fresh tulsi basil leaves.

Blend the mixture on high speed until it transforms into a smooth, slushy consistency, typically around 60-90 seconds. Stop and scrape down the sides of the blender if necessary.

Immediately pour your refreshing Watermelon Lime Slush into chilled cups to maintain its icy texture. Garnish with a sprig of tulsi basil or a lime wedge for a pretty presentation.