Cut watermelon flesh into ice cube-size pieces and freeze on a sheet tray lined with wax paper until solid, about 2 hours.
Shake sherry with lemon juice, simple syrup and ice in a cocktail shaker. Place 3 to 5 watermelon cubes in a Collins glass (save remaining watermelon cubes for another use). Strain the liquid over the cubes. Top with cava.
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