What is the name of the old pickle from Yangqu County, Taiyuan, China?

The old pickles of Taiyuan Yangqu County, also known as mustard pimples, is a traditional Shanxi local cuisine. It is made from mustard as raw material through the process of pickling and fermentation, and has a savory taste with a certain spicy flavor. This old pickle has a long history and has been passed down to the present day, and is one of the favorite foods of many Shanxi people. The method of making old pickles in Yangqu County, Taiyuan, is quite unique. You need to use fresh mustard greens, remove the leaves and roots, and leave only the mustard lumps. Wash it, dry it, and then pickle it with salt, pepper and other seasonings for a period of time. Take out the pickled mustard lumps and dry the surface. Put the dried mustard lumps into the tank, with stones and other heavy objects to compact, seal the mouth of the tank, placed in a cool ventilated place for fermentation.