The popularity of sushi in Japan may have been associated with Buddhism.
Buddhism was imported in the 6th century AD, and quickly became one of the major religions. One of the rules of Buddhism was to restrain from eating meat, and fish was not counted as such.
Churros resemble doughnuts but are created from steamed dough.
Native doughnuts, as well as the aforementioned Chinese youtiao, are made from deep-fried yeast dough.Churros are prepared by squeezing the previously prepared steamed dough directly into the fat.