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Easy Japanese Spicy Tuna Onigiri

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Enjoy this delicious Spicy Tuna Onigiri—a yummy Japanese rice ball. It's a tasty mix of spicy mayo, tuna, and nori for a flavorful bite. Make it at home with ease to experience a touch of Japan in your kitchen!

The image depicts a hand holding a rice ball filled with tuna in the center, with sesame seeds sprinkled on top, and bitten in half. In the background, there is a plate of tuna onigiri, a bottle of sriracha sauce, and a sunflower.

If you love these quick onigiri snacks with spicy tuna filling, you’ll also enjoy other delicious recipes! Try my baked salmon and prawn sushi cups for a quick lunch or my turkey mince noodle dish for weeknight dinners.

My take on Korean-style Keema is a flavorful option that will impress. Don’t miss the soft buns made with tangzhong from the Asian cuisine collection —they’re fluffy and perfect for any burger or sandwish! Each recipe offers a tasty twist for quick lunches or easy dinners.

This quick and easy onigiri recipe is not only a culinary treat but also a reliable go-to for its simplicity and universal appeal. Prepared with basic ingredients, these protein-packed balls promise a satisfying bite, making them an excellent choice for both busy families and solo adventurers in the kitchen.

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Onigiri comes in various shapes and fillings, from the classic salmon or tuna with mayo to the more traditional umeboshi (pickled plum) or kombu (seaweed). You can get creative with fillings like spicy tuna, teriyaki chicken, or even kimchi, giving each rice ball its unique twist.

What's interesting about onigiri is that they're not just a simple snack—they hold a deep cultural significance in Japan. They’re often seen in bento boxes, convenient for lunch or picnics, and have been enjoyed for centuries. Whether you shape them into triangles, circles, or logs, they’re versatile, easy to customize, and perfect for meals on the go!

Japanese Spicy Tuna Onigiri - Watch How To Make It

Sometimes it helps to have a visual – so watch me make this Tuna Onigiri recipe!

Spicy Tuna Onigiri

What is Onigiri?

Onigiri, also known as rice balls, is a popular Japanese snack made from cooked rice shaped into triangular or oval forms. It's often wrapped in nori (seaweed) and filled with various ingredients, such as pickled plum (umeboshi), salted salmon, or tuna mayo. Onigiri is convenient for on-the-go meals and is commonly enjoyed as picnic food or a bento lunch item. The rice is usually seasoned with a little salt and can be garnished with sesame seeds or other toppings.

Why this recipe works 

Try this Japanese Rice Dish - a tasty combo of spicy tuna filling and seasoned rice. It's easy to make with pantry basics, perfect for a quick meal or snack. The spicy kick adds a hint of flavour. Like your fave Tuna Potato Fritters, they might become a household go-to, bringing joy to every bite. Dive into the simple, tasty happiness of Asian cuisine!

Ingredients to make Spicy Tuna Onigiri

Labeled ingredients for making Japanese tuna onigiri, including cooked sushi rice, rice vinegar, canned tuna, mayonnaise, Sriracha sauce, nori seaweed strips, optional onion flakes, and sesame seeds
  • Sushi rice - This is a short-grain rice variety that becomes sticky when cooked. It's seasoned with a mixture of rice vinegar, sugar, and salt to give it a distinctive taste and texture for sushi and onigiri.
  • Canned tuna - Provides a protein-rich filling for the onigiri. It's often flaked and mixed with other ingredients to create a spicy centre. In this recipe, it is best to use canned tuna rather than cooked tuna, with it being more convenient to use.
  • Mayonnaise - Adds a creamy texture to the spicy tuna mixture.
  • Sriracha sauce - It is a hot chilli sauce that brings spiciness to the dish. The amount used can be adjusted to control the level of heat.
  • Sheets of nori (seaweed) - These are dried seaweed sheets commonly used in Japanese cuisine. In this context, they are likely used to wrap the onigiri or bring flavour elements. They add a subtle oceanic taste and a bit of crispness. You can also use Shredded Seaweed Flakes or Furikake, a great addition to the rice balls.
  • Onion flakes - These are dried and crushed onion pieces, and greatly contribute to the recipe.
  • Sesame seeds -Either white or black, they are used to add nutty hints and a bit of crunch. They are often toasted to enhance their aroma. Sprinkling them on the onigiri adds a delightful texture.

Substitutions

Most of the main ingredients are simple and easy to get if you're missing some. In many of my recipes, I provide alternative options, and here are a few for this one:

  • Rice: Quinoa, couscous, or cauliflower rice can be alternatives if you're looking for low-carb options. Each has a distinct texture, so choose based on your preference.
  • Canned Tuna: Cooked and shredded chicken, cooked and flaked salmon, or even cooked and mashed chickpeas can be used as a non-seafood alternative.
  • Mayonnaise: Greek yoghurt, sour cream, or a mixture of mustard and a bit of olive oil can provide a creamy texture with a different flavour profile.
  • Sriracha Sauce: Any hot sauce of your choice can work, such as Tabasco, Sambal Oelek, or a homemade chilli paste. Adjust the quantity to match your preferred level of spiciness.
  • Sheets of Nori (Seaweed): Collard greens or large lettuce leaves can be used as a wrap or you can skip the wrapping altogether and create open-faced onigiri.
  • Onion Flakes: Freshly diced onions, green onions, or chives can be used as alternatives. You can also use onion powder if you prefer a milder flavour.
  • Sesame Seeds: Sunflower seeds, pumpkin seeds, or chopped nuts can provide a similar crunchy texture. If you want to skip seeds altogether, however, the dish will still be flavorful.
The picture shows a plate with tuna rice balls topped with sesame seeds, a little bit of spicy mayo, and onion flakes. There's also a bottle of sriracha sauce and a sunflower next to it.

Variations

Feel free and use whatever ingredients you have. This way, you might find new recipes to add to your favourite list. Here are some different ways you can make Spicy Tuna Onigiri Balls:

  • Avocado: Add diced avocado to the spicy tuna mixture for a creamy and fresh twist. The buttery texture of avocado complements the heat of the tuna.
  • Soy Sauce Glaze: Brush the onigiri with a soy sauce glaze before serving. This adds a savoury umami flavour.
  • Pickled Radish: Place a small piece of pickled radish or daikon in the centre of the tuna mixture. It adds a burst of tanginess and colour.
  • Cucumber: Mix finely diced cucumber into the spicy tuna for a refreshing and crunchy element.
  • Teriyaki Twist: Brush the onigiri with a teriyaki glaze for a sweet and savoury kick. This variation brings a different dimension to the dish.
  • Mango: Add small cubes of ripe mango to the spicy tuna mixture. The sweetness of mango adds an interesting twist!

How to make this recipe

These Tuna Mayo Rice Balls are super easy to make with very few ingredients. You only need 5 simple things and a couple of minutes to put them together. They're perfect for a quick snack, meal or finger food!

Take a look at this step-by-step guide to making this delicious homemade recipe. The photos make it easy to follow along.

A picture of food on a table. There's a bowl of tuna, a bowl of rice, a bowl of seaweed cut into small pieces, and a tuna onigiri on a plate.

Step 1: Prepare all the ingredients required by the recipe, so everything is at hand.

In the picture, there's a table with different bowls. One has tuna, another has rice, and there's also a bowl with seaweed cut into small pieces. On a plate, there's a rice ball called onigiri with tuna inside. In the middle, a hand is holding a square piece of plastic wrap with cooked rice on it.

Step 2: Place some cling foil in your hand, and add sesame seeds. Take a bit of rice, and flatten it on your palm over the sesame seeds.

In the picture, there's a table with bowls of tuna, rice, and seaweed cut into small pieces. There's also a plate with a special Japanese rice ball called onigiri with tuna inside. In the middle, someone's holding a square piece of plastic wrap with cooked rice, seaweed pieces, and a spoonful of tuna mixed with onion flakes on top.

Step 3: Place spicy tuna on rice, add nori strips, and sprinkle with onion flakes.

In the picture, you can see a table with different bowls and plates. There's a bowl of tuna, a bowl of rice, and a bowl of seaweed cut into small strips. On a plate, there's a special rice ball called onigiri with tuna inside. In the middle of the table, there's a hand holding a round-shaped onigiri wrapped in plastic wrap to make it look like a ball.

Step 4: Gently bring the rice around the filling, shaping it into a ball.

The picture shows a plate with tuna rice balls topped with sesame seeds, a little bit of spicy mayo, and onion flakes. There's also a bottle of sriracha sauce and a sunflower next to it.

Step 5: Place a dollop of spicy mayo and sprinkle extra onion flakes on each onigiri.

The image depicts a hand holding a rice ball filled with tuna in the center, with sesame seeds sprinkled on top, and bitten in half. In the background, there is a plate of tuna onigiri, a bottle of sriracha sauce, and a sunflower.

Step 6: Serve these spicy tuna onigiri balls as a delicious snack, lunch, or picnic treat.

A full list of ingredients and instructions can be found in the recipe card below.

Leftovers and storage

These rice balls are best consumed when fresh, although if you make too much you can store them in the refrigerator. Be aware that the rice will dry out if not stored accordingly.

  • Place the onigiri in an airtight container or place them individually in plastic wrap.
  • Refrigerate within 2 hours of preparation to maintain freshness.
  • If you plan to consume the leftovers within 1-2 days, refrigeration is sufficient to maintain their freshness.

Recipe FAQs

For this recipe, it is best to use Sushi Rice, as this type of rice has a sticky texture when cooked. This stickiness is essential for onigiri, as it helps the rice hold together and maintains its shape when moulded into balls.

While sushi rice is the traditional choice for onigiri due to its sticky texture and seasoned flavour, you can experiment with other types of rice for different textures and tastes. Here are some alternatives:

  • Short-Grain Rice: Short-grain rice varieties, such as Arborio or Calrose rice, can work as alternatives. They are stickier than long-grain rice but may have a slightly different texture.
  • Medium-Grain Rice: Medium-grain rice, like Bomba or Valencia rice, can also be used. It's stickier than long-grain rice but less sticky than traditional sushi rice.
  • Sticky Rice (Glutinous Rice): Sticky rice is a glutinous rice variety that becomes very sticky when cooked. It's commonly used in Asian cuisines and can be a good substitute for sushi rice.
  • Brown Rice: While not as sticky as white rice, brown rice adds a nutty flavour and extra nutritional benefits. Keep in mind that the texture will be different, and it may not hold together as well.
  • Black Rice: Black rice, also known as forbidden rice, has a nutty flavour and a chewy texture. It can add a unique twist to onigiri but may not stick together as well.
  • Quinoa: Quinoa is a versatile and nutritious alternative. While it won't be as sticky as rice, it works well as a healthier option.
  • Cauliflower Rice: For a low-carb option, consider using cauliflower rice. It won't be the same as traditional rice, but it can be shaped into onigiri and offers a light, fresh taste.

Wet your hands with water or a mixture of water and a bit of salt before handling the rice. This helps prevent the rice from sticking to your hands.

Tabasco, Sambal Oelek, Kewpie Mayo or any hot sauce of your choice can be used as a Sriracha substitute.

Yes, onigiri can be enjoyed cold, especially if it's well-seasoned and has flavorful fillings. Store them in the refrigerator and take them out when ready to eat.

Yes, you can make onigiri without a mould. A handy alternative is using cling film to shape them into convenient balls. Just place a portion of seasoned rice onto cling film, add your desired filling, then gather the edges of the film, twisting to shape it into a ball.

Looking for more? Check out +65 Best Mains Easy Recipes

Ingredients

  • 300 g sushi rice cooked
  • 280 gr cans tuna in oil or brine
  • 1 tbsp mayonnaise
  • 1 tsp Sriracha sauce 
  • 3 sheets of nori seaweed, cut into small strips
  • Onion flakes (optional)
  • Sesame seeds (optional)
A picture of a plate on a table with baked salmon and prawn sushi cups. The dish is topped with green onions, avocado pieces, spicy mayo, and sesame seeds.
Baked Salmon and Prawn Sushi Cups

Method

  • Cook the sushi rice according to the package instructions and let it cool slightly. Gently mix it with 3 teaspoon rice vinegar.
  • In a bowl, mix the tuna, mayonnaise, and Sriracha sauce until well combined.
  • Prepare a small piece of cling foil and place it in your hand. Spread some sesame seeds out on the cling foil.
  • Grab a small amount of seasoned rice and flatten it on the palm of your hand over the sesame seeds.
  • Spoon a little bit of the spicy tuna mixture onto the centre of the rice.
  • Add some strips of nori sheet and sprinkle some onion flakes on top of the tuna mixture.
  • Gently fold the rice around the filling, shaping it into a rectangle or ball.
  • If desired, wrap a strip of nori around the onigiri for extra flavour and to make it easier to hold.
  • Repeat the process with the remaining rice and tuna mixture.
  • Add a small amount of spicy mayo on top of each onigiri, sprinkle with extra onion flakes, and ENJOY! 

How to cook sushi rice without a rice cooker

Ingredients

*these are the quantities for this recipe that results in 300g cooked and seasoned sushi rice

  • 220 g sushi rice (about 1 cup)
  • 320 ml water (about 1 ⅓ cups)
  • 1 ½ tablespoon rice vinegar
  • 2 tablespoon sugar
  • ½ teaspoon salt

Instructions:

  • Rinse the rice: Place 220 grams (about 1 cup) of sushi rice in a fine mesh strainer. Rinse it under cold water until the water runs clear. This helps remove excess starch, preventing the rice from becoming too sticky.
  • Soak the rice: After rinsing, let the rice soak in fresh water for about 30 minutes. This step ensures the rice absorbs moisture evenly during cooking.
  • Cook the rice: Drain the soaked rice and transfer it to a pot. Add 320 ml (about 1 ⅓ cups) of water. Bring the water to a boil over medium heat, then reduce the heat to low. Cover the pot with a tight-fitting lid and let it simmer for 18-20 minutes. Avoid lifting the lid while it’s cooking!
  • Let the rice rest: Once the water has been absorbed and the rice is tender, remove the pot from the heat and let it sit, covered, for 10 minutes. This allows the rice to finish steaming.
  • Prepare the seasoning: While the rice is resting, mix 1 ½ tablespoons of rice vinegar, 2 tablespoons of sugar, and ½ teaspoon of salt in a small bowl. Heat gently until the sugar and salt dissolve.
  • Season the rice: Transfer the warm rice to a large bowl. Drizzle the vinegar mixture over the rice and gently fold it in using a rice paddle or wooden spoon. Be careful not to smash the rice.
  • Cool the rice: Allow the seasoned rice to cool to room temperature before using it for sushi.

More Tuna Recipes

Did you make this Spicy Tuna Onigiri recipe? Please share your experience by rating it ⭐️⭐️⭐️⭐️⭐️ and dropping a comment below. Your feedback is greatly appreciated and fuels my passion for creating recipes!

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In the foreground, a plate displays a rice ball generously sprinkled with sesame seeds, revealing a tantalizing tuna filling. Adjacent to it, a plate of tuna onigiri adds to the culinary array. In the backdrop, a bottle of sriracha sauce stands beside a vibrant sunflower, completing the picturesque scene.

Spicy Tuna Onigiri

Claudia Ciorteanu
Create tasty Spicy Tuna Onigiri at home! Mix spicy mayo and tuna, shape into rice balls, wrap with nori, and enjoy a flavorful Japanese snack. Simple to make and delicious to eat!
5 from 7 votes
Print Recipe Pin Recipe Save Recipe
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Course Dinner, Lunch, Party Food, Snack
Cuisine Japanese
Servings 4
Calories 471 kcal

Equipment

  • cling film (plastic wrap)

Ingredients
  

  • 300 g sushi rice cooked (about 1 ½ cups) *see the recipe in the post
  • 3 teaspoon rice vinegar
  • 2 x 80 g cans tuna in oil or brine (2x2.8 oz cans)
  • 1 tablespoon mayonnaise
  • 1 teaspoon Sriracha sauce adjust to your spice preference
  • 3 sheets of nori seaweed cut into small strips
  • Onion flakes optional
  • Sesame seeds optional

Instructions
 

  • Prepare the sushi rice following the package instructions, or check out the instructions in the post to make the right amount that yields 300g of cooked and seasoned sushi rice.
    300 g sushi rice, Sesame seeds
  • In a bowl, mix the tuna, mayonnaise, and Sriracha sauce until well combined.
    3 teaspoon rice vinegar, 2 x 80 g cans tuna in oil or brine, 1 tablespoon mayonnaise
  • Prepare a small piece of cling film and place it in your hand. Spread some sesame seeds out on the cling foil.
  • Grab a small amount of rice and flatten it on the palm of your hand over the sesame seeds.
    Onion flakes
  • Spoon a little bit of the spicy tuna mixture onto the center of the rice.
  • Add some strips of nori sheet and sprinkle some onion flakes on top of the tuna mixture.
    3 sheets of nori seaweed, 1 teaspoon Sriracha sauce
  • Gently fold the rice around the filling, shaping it into a rectangle or ball.
  • If desired, wrap a strip of nori around the onigiri for extra flavor and to make it easier to hold.
  • Repeat the process with the remaining rice and tuna mixture to make more onigiri
  • Add a small amount of spicy mayo on top of each onigiri and sprinkle with extra onion flakes.
  • Serve the spicy tuna onigiri as a delicious snack, lunch, or picnic treat.

Video

Notes

Step-by-Step Guide: You'll find a helpful step-by-step guide to making this recipe on my blog. The photos make it easy to follow along.
Substitutions & Twists: I've listed some great substitutions and variations in the post above, so you can customize the dish to your liking.
Storage: This spicy tuna onigiri can be stored in the refrigerator in an airtight container for up to 2 days. 
Tip 1: Use the right type of rice - Sushi rice is the traditional choice for onigiri due to its sticky texture and seasoned flavour. 
Tip 2: Choose a quality Canned Tuna  - Having the best ingredients will help the recipe become tastier. In this case, a good quality canned tuna will add more flavour to the dish. 
Tip 3: Consume while fresh  -Tuna onigiri is best consumed fresh as it retains its ideal texture and flavours. The rice maintains a satisfying stickiness, and the filling stays moist, offering a delightful contrast in each bite.

Nutrition

Calories: 471kcalCarbohydrates: 61gProtein: 30gFat: 10gSaturated Fat: 2gPolyunsaturated Fat: 4gMonounsaturated Fat: 3gTrans Fat: 0.01gCholesterol: 17mgSodium: 408mgPotassium: 243mgFiber: 2gSugar: 0.05gVitamin A: 167IUVitamin C: 1mgCalcium: 21mgIron: 2mg
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Comments

  1. Tisha says

    5 stars
    Such a fun and delicious recipe. These were a big hit with my family

    Reply

  2. Lathiya says

    5 stars
    This is a fun recipe to make and the flavors were amazing. I made this for dinner last night and everyone loved.

    Reply

  3. Sonja says

    5 stars
    This Tuna Onigiri is fantastic for those days when I really want the Sushi flavor, but am way too lazy to go through the hassle of making rolls, let alone find good raw fish. So easy and the flavor is great!

    Reply

  4. Juyali says

    5 stars
    Made this today, and it was so good! The spicy tuna had the perfect kick, and it was super easy to put together.

    Reply

  5. Nora says

    5 stars
    Spicy Tuna Onigiri is such a fun and flavorful treat! The creamy, spicy tuna filling pairs perfectly with the soft rice and crispy nori. So easy to make at home and a great way to bring a little taste of Japan to my kitchen—definitely making these again!

    Reply

  6. Lindsey B says

    5 stars
    I love this spicy tuna recipe! Perfect dish for bringing to potlucks and parties!

    Reply

  7. Laurie says

    5 stars
    I actually think I can make these! They're adorable. I would make with white rice and quinoa so appreciate the other options!

    Reply
5 from 7 votes

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