Potatoes may not be the first ingredient that comes to mind when you think of Chinese food, but in the northern provinces it's not uncommon to see a cold potato dish such as this served as part of a meal. Ginger, chilli and sesame add fragrance and flavour, while Chinkiang vinegar brings requisite piquancy to the table. The potato is cooked very quickly so it still retains a little crunch. You may never look at potato salad the same way again.
Note Chinkiang vinegar, a Chinese black rice vinegar, is available from Asian grocers.