The most popular variety , Zhenjiang vinegar , originates in the city of Zhenjiang in Jiangsu Province , eastern China .
There is no fixed recipe , so some Chinese black vinegars may contain added sugar , spices , or caramel color .
The most popular variety , Zhenjiang vinegar , originates in the city of Zhenjiang in Jiangsu Province , eastern Chinese .
There is no fixed recipe , so some Chinese black vinegars may contain added sugar , spices , or caramel color .