I love crystallised stem ginger, but since being diagnosed with type2 I have been worried about eating it. At first I just washed the extra sugar coating off by know wondering if I should be eating it at all?
The process of crystallizing the ginger involves repeated cooking in sugar solution so unfortunately it's full of the stuff. But the only way to find out how you react to the bought stuff is to eat a piece and test before and 1 and 2 hours after eating it.
However if you search Google you'll find recipes for low carb candied ginger using (diabetes friendly sugar alternatives ( e.g. erythritol or stevia) which might be an option!