California rolls contain cucumbers, crab sticks, crab sticks, avocados, white radish strips, mushrooms, cucumbers, ham strips, sushi rice, carrots and so on. California roll is a kind of rolled sushi, which is made of cucumber (cucumber), crab fillet (crab stick), avocado (avocado) and mayonnaise (mayonnaise sauce), rolled with seaweed (seaweed), and then sprinkled with white sesame seeds or crab roe (flying fish roe) on the outer rice. Because the practice is usually to spread rice on laver (seaweed), and then turn one side of laver upside down to wrap the material inside, this kind of rolled sushi is also called reverse roll or inner roll.