“The filling for the rice ball is the wasabi leaves and stem marinated overnight in soy sauce. You make that into a rice ball using sushi rice... ... and wrap dried seaweed around it to create a rice ball the size of a ping-pong ball. Meanwhile, you create a barazushi. Ingredients like grilled saltwater eel with sauce, kohada marinated in vinegar, kanpyo, steamed shrimp, steamed abalone and others... ...are all chopped up... ...and mixed into the rice. Then use the small rice ball you made beforehand as the next filling... ... to create a larger rice ball. And then you coat it with thin strips of grilled egg.”
Book:The Joy of Rice