Before mixing ingredients, be sure that your chosen ice cream maker is ready to churn ice cream (attachments frozen, ice added, etc).
Using a food processor, blend watermelon, powdered sugar, grapefruit soda, orange liqueur, and rosé wine until smooth.
Pour the blended watermelon cocktail mixture into the chilled bowl/attachment of your ice cream maker.
Churn watermelon cocktail for 25-30 minutes or until desired consistency is reached. If you'd like the cocktail to be drinkable with a straw, serve frozen watermelon cocktails immediately. If you'd like the consistency to be more like Italian ice, transfer watermelon cocktail to a storage container and let it freeze for another 4-6 hours before serving.
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