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Easy onigiri rice ball recipe stuffed with a delicious mix of canned tuna, mayonnaise and soy sauce.

Tuna Mayo Onigiri

A fluffy Japanese rice ball filled with a savory tuna and mayonnaise filling, Tuna Mayo Onigiri (ツナマヨおにぎり) is a modern staple of Japanese bento lunches. In this recipe, I will show you everything you need to know to make the best tuna mayonnaise rice ball.
Course Entree
Cuisine Japanese
Keyword bento, picnic, rice-ball
Level Beginner
Main Ingredient Fish, Rice
Diet Dairy-Free, Low Sugar, Pescatarian
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings 3 servings
Calories 487 kcal


  • 1 1/2 cups Japanese short-grain rice 2 rice cooker cups
  • 1 2/3 cups cold water
  • 85 grams chunk tuna in oil 1 small US can
  • 3 tablespoons Japanese mayonnaise such as Kewpie
  • 1 teaspoon soy sauce
  • 6 wild sesame leaves green shiso or nori will work too
  • Salt


  1. Wash and cook the rice according to the directions in my sushi rice recipe (but use the proportion of rice and water in this recipe).

  2. While the rice cooks, open the can of tuna and drain out any excess liquid. Add the tuna to a bowl along with the mayonnaise and soy sauce. Mix well to form a uniform paste.
  3. Prepare a bowl of water and a small bowl of salt.
  4. When the rice is cooked, stir it to fluff and then transfer it to a bowl to cool slightly and cover it with a damp towel to keep it from drying out.
  5. When the rice is cool enough to handle but still on the hot side, wet your hands in the water bowl. Dab your index finger in the bowl of salt and rub the salt around your hands.
  6. Working quickly, scoop 1/6 of the rice into your non-dominant hand and make a little well in the center of the rice.
  7. Add about 2 teaspoons of tuna mayo filling into the well and cover the tuna with the surrounding rice.
  8. Cup the hand holding the rice like a taco and then use 2-3 fingers of your opposite hand to shape the rice into a triangle.
  9. Toss the rice ball onto another side and then repeat the cupping and shaping step. Repeat until the onigiri is the desired shape.
  10. Wrap the Tuna Mayo Onigiri with a wild sesame leaf, and repeat steps 5-10 until you run out of rice.
Nutrition Facts
Tuna Mayo Onigiri
Amount Per Serving
Calories 487 Calories from Fat 117
% Daily Value*
Fat 13g20%
Saturated Fat 2g10%
Cholesterol 15mg5%
Sodium 324mg14%
Potassium 201mg6%
Carbohydrates 74g25%
Fiber 1g4%
Sugar 1g1%
Protein 14g28%
Calcium 30mg3%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.