California roll

California roll or California maki is an uramaki (inside-out makizushi roll) containing imitation crab (or rarely real crab), avocado, and cucumber. Sometimes crab salad is substituted for the crab stick, and often the outer layer of rice is sprinkled with toasted sesame seeds or roe (such as tobiko from flying fish). As one of the most popular styles of sushi in Canada and the United States, the California roll has been influential in sushi's global popularity, and in inspiring sushi chefs around the world to create non-traditional fusion cuisine. The main wrapped ingredients are the avocado and imitation crab (surimi sticks); these are all typically wrapped with seaweed, although soy paper can be used. Premium versions may use real crab, as in the original recipe. The cucumber may have been used since the beginning, or added later, depending on the account. The inside-out roll may be sprinkled on the outside with sesame seeds, although tobiko (flying fish roe), or masago (capelin roe) may be used.

Source: Wikipedia