La Hot Duck in the Inner Richmond - San Francisco

Good find. This appears to be a branch of an LA enterprise:

https://www.lahotduck.com/

In turn, the LA store probably represents the US invasion of the Wuhan spicy duck neck craze that exploded in China just after the turn of the century:

http://kaleidoscope.cultural-china.com/en/8Kaleidoscope4151.html

The Wuhan duck neck craze itself can be directly traced to a wonderful movie (and subsequent TV series), Life Show about the life of a single woman (played by Tao Hong) who runs the best duck neck stall in the Wuhan Night Market.

Much of the action revolves around her duck neck stall and the movie has a number of mouth-watering scenes. Some day I’m going to put together an Asian food mini-film festival and this movie is on the short list.

Hyperbowler might want to confirm the Wuhan connection for this food so he can add it to the Hubei cateory in his epic regional Chinese restaurant list.