Has anyone had any success creating dextrose icing sugar? My sister told me her thermomix (see thermomix.com.au if you don't know what it is) can turn caster sugar into icing sugar. So I figured I would try to turn dextrose into icing sugar. I put the dextrose through the machine and have ended up with superfine dextrose. It isn't as soft/silky in feel as icing sugar, but it's much much finer than when you buy it, or even after grinding it in a mortar and pestle.
I haven't tried to make icing with it yet, so I was just wondering if anyone else had done this and whether it needed to be treated differently to icing sugar in order to work? I've struggled to make fructose-free icing despite the recipes in David's book.