Clementine sorbet (Slideshow version)
Stage 9/10 :
The jam sugar contains a natural gelling agent: fruit pectin.This is not essential, but it does make a smoother sorbet which does not go as hard when you put it in the freezer.
Without jam sugar, your sorbet will tend to "clump", like in this photo. This is simply a matter of texture and does not affect the flavour at all.