I made them exactly as written the first time, and the second time I was feeling adventurous and used Chinese black vinegar in the final step. (epicurious.com)
Although it's not essential to use the vegetarian black vinegar, it does add another layer of complex flavors that you don't get with another vinegar. (fieryfoodscentral.com)
On a serving plate or bowl, place equal parts of your favourite olive oil and top - of - the - line balsamic black vinegar. (remonline.com)