Tuna Onigiri Recipe – Spicy Japanese Rice Balls

Learn how to make onigiri, a popular Japanese rice ball snack. This tuna onigiri recipe is easy to follow and will help you create perfect onigiri every time. The combination of savory tuna and spicy Japanese mayo create a prefect onigiri filling!

Tuna onigiri Japanese rice ball with japanese mayo
What is Onigiri?

Onigiri is one of the most recognizable Japanese snacks there is. From homemade lunches to convenience stores, onigiri can be found just about anywhere. The Japanese rice ball is really simple. Rice is shaped in (usually) a triangle and filled with some sort of salty or sour filling. Popular choices are umeboshi (pickled plums), shake (salted salmon), okaka (bonito flakes with soy sauce), and what I’m showing you today: spicy tuna onigiri filling made with Japanese mayo.

3 Tuna mayo onigiri lined up with a bowl of tuna in the background.

Tuna Onigiri Japanese Rice Ball

Tuna is one of my favorite proteins to work with because it’s so quick and easy! No defrosting, no making sure it’s cooked through… you just open it and go! It makes tuna mayo onigiri such an easy recipe. I also have a tuna takikomi rice, made in a rice cooker, and a canned tuna sushi hand roll recipe, so check those out for more tuna ideas!

Hand holding a tuna mayo onigiri with a bite taken out of it.

Tuna Mayo Onigiri

In my home, mayo is the most popular tuna onigiri filling. Probably because we always have tuna in the pantry and mayo in the fridge. Our favorite time to make it is for Sunday lunch. My kids love shaping their own tuna onigiri, so we turn it into a nice family activity.

My favorite brand of tuna is Wild Planet Wild Albacore Tuna, because it is sustainably caught, tastes better, and is high quality. For me, it’s worth the higher price point, and I always have a few cans handy.

3 tuna mayo onigiri lined up with some seaweed on the side.

How to Make Japanese Rice Balls

These Japanese rice balls are so easy to make, but there are a couple of specialty ingredients. Firstly… Japanese mayonnaise. It’s not the same as American mayonnaise, and you HAVE to give it a try! The most well known brand in Japan is called Kewpie. Second, Japanese nori, or seasoned seaweed. Last but not least, mirin. You should have mirin in your pantry if you want to make Japanese food, as it is a commonly used ingredient. You can get these online, but they are cheaper at your local Asian store/market.

Give tuna onigiri a try! Tuna and mayo go together so well!

Tuna mayo onigiri, or rice ball, is a simple and delicious Japanese snack. Rice is filled with a flavorful tuna and mayonnaise, shaped, and wrapped with a sheet of nori (seaweed). 

13 thoughts on “Tuna Onigiri Recipe – Spicy Japanese Rice Balls”

  1. 5 stars
    Really delicious. Finally satisfied my curiosity after watching fruits basket. I omitted mirin because we’re Muslim but still super tasty!

  2. I made this for dinner earlier! I used the mirin but did omit the sugar; I’m sure its good that way too though. The tip with using plastic wrap to shape the onigiri REALLY helped, and it was great that i could keep using the same sheet – the salt stuck to it after the first ball and made it coat the second one more evenly.

    I also doubled every ingredient. I have a big appetite and wasnt sure it would be enough otherwise. Worked out perfectly!

  3. Hello, Do you use tuna packed in oil or water? I have also read that you can turn American mayo into Japanese mayo with a little rice vinegar and sugar…what do you think? Can’t wait to try this! (I just went to make it and put on the rice only to discover I have no tuna. The only thing I have to put in is Pork Fu. We’ll see…)

    • I use tuna packed in water! I know that Japanese Kewpie uses msg (gasp!), but the American version doesn’t… I can’t remember what they added instead of MSG in the American one. Maybe they add rice vinegar and sugar?! 😉

  4. 5 stars
    Tried this recipe exactly as written (assuming T meant tsp and not tbs) and it was Perfect! Will be a delicious staple in our family.

    • Hi Jane, glad you liked it! T is actually tablespoon, but the recipe is quite flexible, so I bet the flavoring was a little lighter but still delicious :). Thanks for the comment!

  5. 5 stars
    This recipe was absolutely delicious, thank you for sharing it. It made a great snack to take to my nephews game and share with the family.

  6. Your onigiri are so cute and perfectly shaped! Love the idea of getting the kids involved with shaping them 😀 And I’m also really liking the little addition of mirin you add to the tuna mayo filling – it sounds perfect, and surely packs a nicely balanced little punch of flavor inside the rice. Thanks for the ideas!

    • Thank you! And getting the kids involved… I don’t have a choice. If they see me making it, they bug me until I let them join in :).

5 from 4 votes

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