Meat in a donkey burger is typically braised, chopped up into small pieces and then wrapped in cooked bread, and is particularly popular in northern China. (Shutterstock/File)
The next time you bite into your favorite donkey burger beware -- it might actually be horse, pig or even mule meat.
That is the warning from authorities in China after a media investigation revealed that some butchers in a city famed for its donkey burgers had engaged in a nefarious plot to substitute donkey with cheaper meats.
Restaurants all over China, but mainly in Beijing, bought the fake donkey meat, the state Xinhua news agency and other Chinese media said.
Underlining the severity of the problem, authorities in the northern city of Hejian -- unofficial home of the donkey burger -- called an emergency meeting on Monday and launched an investigation.
Food inspectors seal facilities used to produce fake donkey meat during a raid in Hejian in China's northern Hebei province on January 9, 2018. (AFP/File)
Officials there vowed to punish those producing the dodgy donkey meat, which was also transported beyond Beijing to other cities around China.
Undercover reporters with Beijing News exposed the ruse, filming a dingy workshop in Hejian where red meat was dumped in buckets and lay on wooden slabs.
Meat in a donkey burger is typically braised, chopped up into small pieces and then wrapped in cooked bread, and is particularly popular in northern China.
In fact, it is so popular that it has spawned a well-known saying: "In heaven there is dragon meat, on Earth there is donkey meat."