Okaka Onigiri: The Salty Soy Sauce And Katsuobushi Recipe

by Joost Nusselder | Updated:  August 30, 2022

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Okaka is a simple mix of katsuobushi (bonito fish flakes) and soy sauce that’s often served on top of a simple bowl of steamed rice, that’s really all you need.

So it’s only natural it would find its way to one of the best Japanese snacks, onigiri.

Let’s make this simple but delicious and salty dish!

Okaka onigiri

How to make okaka onigiri

Okaka onigiri recipe

Okaka Onigiri Recipe

Joost Nusselder
Okaka is a Japanese katsuobushi and soy sauce mix, like furikake but with less ingredients and a little saltier. That makes it perfect for a simple and quick onigiri rice ball that really doesn't need anything else.
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Prep Time 45 mins
Cook Time 30 mins
Total Time 1 hr 15 mins
Course Snack
Cuisine Japanese
Servings 4 people

Ingredients
  

Steamed rice

  • 2 cups Japanese short-grain rice uncooked
  • cups water

For making onigiri

  • 1 tsp salt (sea salt or kosher; use half if you choose to use table salt)
  • 4 sheets nori (seaweed)
  • 4 tbsp katsuobushi dried bonito flakes
  • tbsp soy sauce
  • 2 tsp toasted black sesame seeds (to garnish)

Instructions
 

Preparing the steamed rice

  • Put your rice in a large rice bowl, gently wash it in a circular motion, and dispose of the water. Repeat this process around 3 – 4 times.
  • Allow the rice to soak in water for around 30 minutes. Move the rice into a rice sieve and allow it to drain completely. This should take around 15 minutes.
  • Now mix the rice and water in a pot with a heavy bottom, and cover it with a lid. Bring the rice to boil over medium heat.
  • Once the water boils, reduce the heat to the lowest setting, and then continue to cook while covered for around 12 – 13 minutes, or until the water is fully absorbed. After 12 minutes, open the pot to see if there's any water present, close the lid, and then continue cooking for an additional minute.
  • Remove the pot from the stove with the lid is on, and then allow the rice to sit for an additional 10 minutes. Next, move the rice to a large plate and fluff it with a rice scooper. Allow it to cool for some time, or until you can comfortably hold it in your hands without burning them. However, you shouldn’t allow the rice to cool down completely.

Preparing the onigiri fillings

  • As your rice soaks and drains for 45 minutes, start preparing the onigiri fillings.
  • For the okaka filling, put the dried bonito flakes (katsuobushi) in a bowl, add 2 tbsp of soy sauce, and mix them together. The bonito flakes should be moist, and no soy sauce should be left on the bottom of the bowl.

Preparing the onigiri

  • Cut the nori sheets into thirds.
  • Mix the rice with the okaka thoroughly.
  • Wet your hands with water to prevent the rice from sticking to your hands.
  • Put some salt in your hands and then rub to spread around your palms. If you're using table salt, make sure that you use half since it's much salter compared to kosher salt.
  • Now scoop the warm rice (around 1/3rd of a cup) into one hand, and then use your hands to mold the rice in a triangle. You can use 3 fingers (thumb, index, and middle fingers) to create a triangle corner. Ensure that your hands are firm to prevent the onigiri from falling apart. Also, make sure that you don’t squeeze your rice very tightly.
  • Use the nori to cover the onigiri.
  • Sprinkle some of the sesame seeds on top of each of the rice balls.
Keyword onigiri
Tried this recipe?Let us know how it was!

Cooking tips

  • If you don’t want to touch the rice at all, you can place a piece of plastic wrap in a rice bowl (or any small bowl) and put the rice on top. Sprinkle on some kosher salt (remember, salt is used to preserve the rice for a long time here).
  • Pull the plastic wrap corners and twist a few times.
  • Form into a triangle shape in the same manner as I described above. 
Favorite Asian Recipes
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A heavy-bottom pot with a tight-fitting lid is recommended, as it’s thicker at the base. This means it absorbs and distributes heat better.

View the basics of making onigiri here in this video:

Favorite ingredients

Okaka is not something you buy pre-packaged because of the soy sauce. The wetness would cause it to deteriorate too fast for it to be packaged.

But you can make it with just the two ingredients.

My favorite katsuobushi to use are these Kaneso bags:

Kaneso katsuobushi

(view more images)

And just add the soy sauce brand of your choice.

You can also use furikake seasoning with okaka flavor I’ve seen from Negatanien. It has the same flavor profile and you can use it mixed in with the rice as well:

Negatanien furikake with okaka flavor for onigiri

(view more images)

Onigiri is easiest to make if you have rice with the right stickiness that’s easy to mold into shapes. That’s why I use this Nozomi short grain rice to make them:

Nozomi short grain sushi rice

(view more images)

Tips and techniques for making Japanese rice balls

Always make sure to use freshly cooked rice

This is the key step that’ll ensure you get the perfect onigiri results! Before making the rice balls, allow your rice to cool slightly.

However, the rice needs to be warm, but not cold when preparing.

Make your hands wet

Always make sure that you wet your hands with water. This prevents the rice from sticking to your hands.

You should always have a bowl of water on your countertop, as this makes things easier!

Rub some salt on your hands

You should salt both your hands and then rub them to spread the salt evenly. This assists in preserving the onigiri, as well as flavoring the rice balls.

Apply a considerable amount of pressure

Don’t apply too much pressure on your rice. This prevents the rice from falling apart as you shape your rice balls. You can opt to shape them into a typical ball, cylinder, or even triangle-shaped onigiri like these.

Avoid squeezing the rice too tight.

Use a kitchen towel to preserve them if you want to use them the following day

If you’re preparing the rice balls for lunch the next day, but you don’t want to prepare them the day of, you can use the following trick. Wrap the finished products in plastic wrap, and then wrap them using a kitchen towel.

This protects the rice ball from being excessively cold as you keep them in your fridge. It’s important to note that rice gets hard when refrigerated. But this easy trick will ensure that your rice balls stay cool and safe.

Recipe variations

When following this recipe, it’s important to note that the fillings can vary. You should use your favorite ones! You can put almost anything you want in Japanese rice balls.

Try putting pickled plums, grilled salmon, pork, beef, dried bonito flakes (katsuobushi) with soy sauce seasoning, turkey, or tuna with mayonnaise.

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Also read: these are the most popular onigiri filling recipes

Check out our new cookbook

Bitemybun's family recipes with complete meal planner and recipe guide.

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Joost Nusselder, the founder of Bite My Bun is a content marketer, dad and loves trying out new food with Japanese food at the heart of his passion, and together with his team he's been creating in-depth blog articles since 2016 to help loyal readers with recipes and cooking tips.