Sometimes there are dots on the back of beef burgers in fast food restaurants. Many netizens suspect that the beef burgers are not clean. What the hell is going on here?

Ruan Guangfeng, deputy director and associate research librarian of Kexin Food and Health Information Exchange Center, said in an interview that the dots on the back of beef patties in hamburgers are actually holes drilled by human beings to allow frozen beef patties to mature quickly in a short time.

Ruan Guangfeng further explained that many of the patties in the beef burger were pressed from ground beef. Before they became patties, they were similar to the meat minced when eating dumplings. It is the "standard operation" of similar products in fast food restaurants at home and abroad to pierce these pressed meat cakes in advance and then freeze them. Because pre punching can not only heat the meat cakes evenly, but also allow the meat juice in the beef cakes to flow into the pierced holes, which not only helps the meat cakes to emit fragrance through high temperature and rapid fire roasting, but also ensures the food delivery speed of fast food restaurants.

When the beef pie is baked in the oven, the exuded blood will condense to the pores, and the protein in the blood will deform and solidify in the pores, thus forming membrane like "small particles". From the visual point of view, these dots are really not beautiful, but there is no inevitable relationship between them and the safety of beef. (Reporter Li Jian)