Philadelphia rolls are some of the most popular and delicious rolls in the world. They first appeared in the U.S. when, in the 1980s, one of the chefs at a popular restaurant showed visitors a brand new roll-turned-rolls. The chef's idea was that the lightly salted salmon covered the rice on top, and the nori was hidden inside. Before, all rolls were cooked with the filling inside. The creator of the delicious rolls with soft cheese Philadelphia had to take this step to attract Americans who didn't want to eat nori. He hid the unloved ingredient inside, and the appearance of the rolls turned out very appetizing.