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I buy these at a local grocery store and inside there is sushi rice with imitation crabsticks and sesame seeds mixed in mayonnaise, I think. This is one of my favourites because I love imitation crabsticks. I would love to learn how to make this mixture at home so I can make my own onigiri at home. I also like onigiris because seaweed and rice is separated with a plastic wrap so it keeps the seaweed from becoming soggy before you can eat it.
All photos are my own.