Add all of the ingredients and 100ml (3⅓fl oz/⅓ cup + 1 tbsp) water to a Creami tub and use a cocktail muddler or rolling pin to crush the raspberries. Cover and transfer to the freezer for 24 hours, or until frozen through.
When ready to serve, pour 100ml (3⅓fl oz/⅓ cup + 1 tbsp) tart cherry juice into the tub and churn on FULL, SLUSHIE in your Creami.