Peel ginger, slice thinly, add to a bowl, sprinkle liberally with kosher salt, leave for an hour to brine.
After an hour, dry ginger with paper towel then add them to a heat resistant bowl.
Add vinegar and sugar to a medium size pan then bring to a boil and stir until sugar dissolves.
Pour vinegar mixture over the ginger and let it sit for 2 minutes.
Drain ginger in a colander then spread it out on a paper towel to cool for 3 minutes.
Pat ginger dry then add it back to the airtight container.
Lasts up to 1 year in the refrigerator.