In a deep saucepan, combine the sugar, water, orange zest, and cinnamon and bring to a boil. Add the pecans and simmer, stirring, as the water evaporates. The glaze will be shiny and transparent at first, then turn opaque, and crystallize as the water cooks away.
When the nuts are completely coated with sugar crystals, they are done. Spread them out on a sheet pan to cool. (To wash the saucepan, soak it overnight.)
These are great as a garnish or to enjoy with drinks. You can use different nuts and different spices if you want to experiment.