Looking at the search results on Baidu, it's very confusing. According to the county records of Jiezi ancient town here in Sichuan, shredded pork with golden sauce (the first golden word) was produced in the period when Huguang filled Sichuan, and then spread to Beijing.

The production period of shredded pork in Beijing sauce recorded on Baidu was 1930, the old man in Beijing.

A 1600 a 1900, do you mean Sichuan food or Beijing food?