根据wiki:
In the 1960s, Los Angeles became the entry point for sushi chefs from Japan seeking to make their fortune in the United States. The Tokyo Kaikan restaurant then featured one of the first sushi bars in Los Angeles. Ichiro Mashita, a sushi chef at the Kaikan, began substituting avocado for tuna (toro) and after further experimentation, the California roll was born.[2] (The date is often given as the early 1970s in other sources.)[3][4][5] Mashita realized the oily texture of avocado was a perfect substitute for toro.[3] Traditionally sushi rolls are wrapped with nori on the outside. But Mashita also eventually made the roll "inside-out", i.e. uramaki, because Americans did not like seeing and chewing the nori on the outside of the roll.[3]
After becoming a favorite in southern California it eventually became popular all across the United States by the 1980s. The roll contributed to sushi's growing popularity in the United States by easing diners into more exotic sushi options.[6] Sushi chefs have since devised many kinds of rolls, beyond simple variations of the California roll. Many sushi restaurants in North America now feature a menu of such rolls
In the 1960s, Los Angeles became the entry point for sushi chefs from Japan seeking to make their fortune in the United States. The Tokyo Kaikan restaurant then featured one of the first sushi bars in Los Angeles. Ichiro Mashita, a sushi chef at the Kaikan, began substituting avocado for tuna (toro) and after further experimentation, the California roll was born.[2] (The date is often given as the early 1970s in other sources.)[3][4][5] Mashita realized the oily texture of avocado was a perfect substitute for toro.[3] Traditionally sushi rolls are wrapped with nori on the outside. But Mashita also eventually made the roll "inside-out", i.e. uramaki, because Americans did not like seeing and chewing the nori on the outside of the roll.[3]
After becoming a favorite in southern California it eventually became popular all across the United States by the 1980s. The roll contributed to sushi's growing popularity in the United States by easing diners into more exotic sushi options.[6] Sushi chefs have since devised many kinds of rolls, beyond simple variations of the California roll. Many sushi restaurants in North America now feature a menu of such rolls
