Grows from sugar cane and processed with a cauldron into loaf form. Broken into lumps with metal tongs. If you eat it you take a queasiness damage point per sugar lump but it also increases your energy.
The sole useful point of sugar will be to feed it to my dang blasted horse so he will move so he is not longer standing on top of me, on top of a trap door when I am holding a chest above my head so I can't click the trap door and go back, nor click him to make him move, nor get around him. Of course since I can't click on him I can't actually feed him the sugar. Instead sugar carried in inventory will make nearby tame horses "frisky" so they shift around a lot.
Rotten, darn, blasted, aggravating horse!!