One of the local specialties is the 'donkey burger'. I know it might sound a bit weird/gross but it's actually pretty good, if you don't think about the donkeys on the street pulling banana carts. There are a lot of places that sell donkey meat here, including my school cafeteria.
There is also a chain of donkey restaurants in Baoding called "Hao Zi Wei", as you can see in the photo. This is where I tried donkey for the first time a few months ago (but I didn't have my camera that time to take a photo of the donkey stomach I also tried), and where I most recently had it again. You can also get various other dishes made of donkey meat such as sausage and 水煮肉片儿.
Donkey might not sound all that good, but I actually enjoyed it. It's got more flavour than beef, in a sort of earthy way. It's quite fatty, which is maybe why it tastes good.
The meat is cooked first, then coarsely chopped on a wooden board, before being placed into the warm bun/bing. The burgers are served plain, without toppings, only the bread (饼 bing) and the meat.