
Granita - Place ingredients in a jug just large enough to fit a stick blender. Blitz until smooth - it should be like a smoothie. Pour in a small container so the depth is no deeper than 3cm / 2.2". Freeze for 6 hours+.
Scrape - Use a fork to scrape into shavings (it's not hard). Use immediately or return to freezer until required.
Serving - Place oysters on a serving platter. (Note 3)