Spicy Tuna Salad Onigiri - These rice balls pack a serious flavor punch, thanks to the addition of sriracha! Learn how to make these easy and delicious rice balls at | bento box, lunch box

Spicy Tuna Salad Onigiri

  • Author: Shannon
  • Category: Onigiri
  • Cuisine: Japanese


Spicy Tuna Salad Onigiri are made extra delicious thanks to one secret ingredient: sriracha! Made from common pantry & fridge ingredients + easily shaped using a rice mold, these lusciously spicy rice balls are sure to be your newest lunch BFF!


Food Items:

Spicy Tuna Salad (makes enough for ~ 4 – 6 onigiri):

  • 3.5 oz can tuna
  • 1 tablespoon mayonnaise
  • 1/2 tablespoon sriracha (add more or less depending on how spicy you like it!)
  • 1/2 tablespoon lemon juice
  • 1 teaspoon sweet pickle relish*
  • Salt & pepper, to taste

Recommended Tools:

  • Onigiri Mold
  • Plastic wrap
  • 4 leaf clover craft punch (optional)


Spicy Tuna Salad:

  1. In a bowl, add (drained) tuna, mayonnaise, sriracha, lemon juice, relish, salt, and pepper. Mix until well combined, then set aside.


  1. In a bowl, add warm sushi rice. Sprinkle black sesame seeds and parsley over top the rice, then mix with a rice paddle or spoon until evenly incorporated. Feel free to add more of either, until you see sesame seeds and parsley evenly dispersed throughout the rice. Set aside.

Decorations (optional):

  1. Take a sheet of nori, and cut it into 9 cm x 3 cm rectangular strips – only cut as many as you’d like for decorating.
  2. With the 4 leaf clover craft punch, punch out about 5 clover shapes from the nori strip, working your way across the strip until you reach the end. Try your best to evenly space each clover cutout and keep them centered.
  3. Reserve the individual clover nori cutouts for decorating. Set strips and cutouts aside.


  1. With a damp paper towel, wipe the inside of your onigiri mold until it’s completely damp.
  2. Using a rice paddle or spoon, fill your mold just below the halfway point with warm rice. Make sure you press the rice gently but firmly into all the crevices.
  3. With the handle of your rice paddle or spoon, make a small indentation in the center of your rice, just deep enough to hold your filling.
  4. Spoon your spicy tuna salad filling into the indent. Be generous!
  5. Fill the rest of your mold with rice, until about the 3/4 point – you’ll need some room for the removable top piece to fit on top.
  6. Take the removable top piece and insert it into the mold. Push with gentle pressure until the top piece is fully inserted into the mold.
  7. Remove the top piece, and flip the rice mold over, making sure to do this over top of a plate covered in plastic wrap. If your rice mold has little push indents on the bottom, push it gently with your thumb, then gently tap the bottom and sides of the mold until the onigiri slides out.
  8. Optional: Decorate your onigiri by wrapping the nori strip with clover cutouts around the base, and/or randomly placing the individual nori clover cutouts atop the onigiri, on all sides.


  • *I originally used capers (instead of relish) in this recipe. I’ve found that I prefer the relish, plus it’s more readily available in everyone’s fridge – for me, this makes it a better ingredient choice. However, feel free to use 1/2 tablespoon of capers (as in the original recipe), if you’d prefer.

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