These include soy sauce from Zhongba, cooking vinegar from baoning, special vinegar from Sanhui, fermented soy beans from Tongchuan, hot pickled mustard tubers from Fuling, chili sauce from ...
They are made from soy beans, which, when dried ... plain (usually sold in small bags), in jars (usually labelled "black bean sauce") or flavoured with garlic and chillies (not that common).