Combine the Aperol, water, and orange juice in a pitcher.
Pour the mixture into the ice trays and freeze until firm, preferably overnight or for at least 6 hours.
Transfer the ice cubes to a blender and add Prosecco, then blend until smooth and frothy.
Pour into 4 chilled wine or cocktail glasses and top off with more Prosecco. Garnish with an orange slice.
Notes
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