2. Roughly chop fruit and custard and blend, adding syrup and soya milk.
3. Serve. If you only half froze the ingredients, freeze for an hour before serving.
You need a powerful blender with ice-breaking capability. If you only have a cheap blender, you'll have to only half freeze the ingredients and then freeze after blending, so the texture won't quite be as good.
posted by Ronny Worsey