The surprising origins of sushi

According to Executive Sushi Chef Kazunari Araki, sushi is not originally Japanese.

He says the combination of rice and fish began in the 3rd century along the Mekong River in Southeast Asia. It was cleaned, gutted and finally covered in a salt and rice mixture for several months in order to preserve it. When the fish was ready for consumption, the rice would be thrown away as it would have become too salty to eat. 

By the 12th century, this process had spread to China, and subsequently Japan, where it was called narezushi. According to Araki, things changed in the 16th century, vinegar replaced salt, which was key to the development of sushi. This also led to the name sushi—which translates to “vinegared rice”.

Another milestone on this journey was reached in the Meiji era, in the 1900s, when people started using ice machines. Fish could be kept fresh without marination. People only needed to cut the fish, place it on top of rice and enjoy the meal!

Please summarize this article in as few words as possible. Do Homework
Did you know about sushi’s origins? If not, did this article surprise you? Do Homework
One might argue that origins almost always come from abroad—Korean kimchi was shaped by traders importing chilis, for instance. So, when does a country's food become its own? Do Homework