Pickled ginger is a traditional condiment served alongside sushi. This form of ginger is thinly sliced fresh ginger that has been pickled in brine and sugar and sometimes tinted pink. Uncolored pickled ginger will be a light flesh color.
You can purchase pickled in ginger in any store with a good selection of Asian foods. You can also purchase it online at numerous sources including Amazon.com Organic Pickled Ginger