Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/2  pound         peeled -- fresh ginger,
                        -- sliced
   1 1/3  cups          japanese rice vinegar -- unsea
   3      tablespoons   cider vinegar
   2      tablespoons   white vinegar
     1/2  cup           sugar
   1      tablespoon    kosher salt

Preparation:

Cover the ginger with boiling water. Let stand for 2 minutes, then drain into colander. Put the ginger in a large, clean glass jar or plastic container. Combine the remaining ingredients in a non-aluminum pot. Stir over moderate heat just until the sugar and salt dissorlve. Pour over the ginger. Let cool then cover and refrigerate for at least 24 hours before using.