
Blackcurrant sorbet is a dairy-free frozen dessert of blackcurrant juice or purée with water and sugar.
Crème de cassis over crushed ice gives the flavor and the color and none of the melting texture, so the drink stops evolving in the glass. Another berry sorbet keeps the texture and moves the flavor somewhere else entirely.
Sherbet
US labeling allows sherbet one to two percent milkfat; sorbet has none. The dairy makes sherbet softer and less sharp, and it will cloud a clear drink.
Granita
Deliberately coarse ice, scraped rather than churned; it chills the same way but stays in crystals instead of dissolving into the drink.
Keep it frozen and keep it closed. Once it melts and refreezes the ice crystals grow coarse, and a sorbet that has been through that goes gritty instead of smooth.