Place the watermelon cubes into the blender jar, ensuring it is not overfilled to allow proper blending.
4 cups ripe watermelon cubes
Add fresh lime juice and mint leaves to the blender. Pulse a few times to evenly distribute ingredients and release mint aroma.
2 tablespoons fresh lime juice, 10 fresh mint leaves mint
Blend on high until the mixture is smooth and evenly puréed, about 30-40 seconds. The puree should be vibrant in color with no large chunks remaining.
4 cups ripe watermelon cubes, 2 tablespoons fresh lime juice, 10 fresh mint leaves mint
Pour the watermelon puree through a fine mesh sieve into a pitcher to remove pulp for a smoother drink, pressing gently to extract as much liquid as possible.
4 cups ripe watermelon cubes
Stir in a pinch of salt to taste, balancing the sweetness and enhancing the flavors. Mix well.
to taste salt
To serve, fill glasses with ice, then pour the watermelon mixture over the ice. Top each glass with chilled soda water and gently stir to combine. Garnish with a sprig of mint if desired, and serve immediately.
1 cup soda water, ice as needed ice