A funny fact is Beijing's famous roast duck is very likely originated from Nanjing. Nanjing has its own style of roast duck and the theory is when Emperor Yongle moved the capital from Nanjing to Beijing he bought all the Nanjingese chef with him and that's how roast duck spread to Beijing. The two styles then evolved in parallel resulting in two different styles we see today (Nanjing roast duck doesn't have the crispy skin).
I saw someone else talk about this on Twitter some time ago and someone else in the thread then asked the very reasonable question "why did the emperor move the capital?" to which the person talking about duck said "oh that's a really exciting part of Chinese history, it's got more drama than Game of Thrones".
Ducks were first domesticated in China as well.