01 - Slice the peeled ginger into thin, even rounds about ⅛-inch thick.
02 - In a medium saucepan, combine the sliced ginger and water. Bring to a boil, then reduce heat and simmer for 35–40 minutes, until the ginger is tender.
03 - Drain the ginger, reserving ¼ cup of the cooking liquid.
04 - Return the ginger to the saucepan with the reserved cooking liquid and 2 cups sugar. Bring to a gentle boil, stirring frequently. Simmer uncovered over medium heat until the syrup thickens and almost evaporates, about 20–25 minutes, and the ginger becomes translucent.
05 - Using tongs or a slotted spoon, transfer the ginger pieces to a wire rack set over parchment paper. Let cool for 10–15 minutes.
06 - While still tacky, toss the ginger slices in the remaining ½ cup sugar to coat. Shake off excess sugar.
07 - Allow to dry completely at room temperature for at least 1 hour.
08 - Store in an airtight container at room temperature for up to 2 months.