Method
Serves 4-6
Place 4-6 glasses in the freezer to chill. Halve plums, remove
stones and lay in a single layer on a tray lined with baking paper.
Place in freezer until very hard (at least 8 hours).
Blitz frozen plums until very finely chopped. Add 3-4 Tbsp of the
reserved juice and blitz until smooth.
Serve immediately in the chilled glasses, or return to freezer
before serving.