What is Onigiri (Omusubi)?

Onigiri (おにぎり) are Japanese rice balls made of steamed rice that you compress into a triangular, ball, or cylinder shape and are usually wrapped in a nori seaweed sheet. You can flavor them lightly with just salt or add a variety of fillings. The word “onigiri” is more commonly used throughout Japan, but it’s also known as nigirimeshi (握り飯) or omusubi (おむすび).Adored by all ages, onigiri prove their importance and popularity in Japanese everyday lives. We make rice balls for school and work lunches and for many outdoor activities and events. In some ways, they are the Japanese idea of energy bars. We snack on onigiri when we need a quick boost of energy and sustenance.

Onigiri’s History

Deemed as the very first traveling food, onigiri were invented before the existence of refrigeration as a means to preserve fresh rice longer so it could be brought along to feed travelers, samurai, soldiers on the road, or farmers in the farm fields. The method was to fill the rice with a salty or sour ingredient as natural preservatives and lightly compact them into portable food that can be carried along and eaten with hands. To keep the rice safe, salt was first used in making the onigiri. Today you can find these rice balls in so many varieties and forms, but the basics of making onigiri remain the same.If you’re an anime or manga (Japanese comics) fan, you have most likely seen onigiri show up in many storylines of these cultural outputs. The most memorable appearance has to be in a scene in Spirited Away, where a boy named Haku offers Chihiro, the main character, some onigiri in the hope of comforting her. As the young girl took a bite of the rice ball, tears started rolling down her cheeks. It tells the powerful connection between food and home and the emotions involved. As you can see, onigiri means a lot to the Japanese.

Ingredients for Onigiri

For the most basic and comforting onigiri, you’ll need only two ingredients. That’s right! You need steamed rice and good-quality nori seaweed.

How to Make Onigiri

What is the Best Rice Cooker

To make the perfectly steamed rice for onigiri, I like to use my Zojirushi NP-NWC10XB Rice Cooker. It makes fluffy rice every time, and it’s the best Japanese rice cooker I’ve ever used! You can get it on Amazon for $458.29, and it’s well worth it if you cook a lot of rice.

Onigiri Filling

Yes, you can fill onigiri with whatever your heart desires, but I’ll share with you some of the most common fillings for onigiri in Japan. Now if you are ready to get creative, look no further than your dinner leftovers. I’ve used my leftovers from Chicken Karaage and Shrimp Tempura to fill my onigiri. Instead of plain steamed rice, you can also use Takikomi Gohan (mixed rice) or Corn Rice.

Onigiri Shapes and Mold

You can make many different shapes of onigiri, and the most common ones are:In this updated recipe post, I used an onigiri mold to demonstrate how to use it. I find it easier to portion each onigiri using the mold.

How to Wrap Nori

There are different ways to wrap the nori around the rice balls. You can cut a sheet of nori into thin strips and wrap the nori around the cylindrical or triangular rice ball shape (this is more like a decoration).You can also cut the nori sheet in thirds and wrap the rice ball with the nori. Some prefer to wrap the rice balls when they are warm so the nori will stick to the rice (but it will be soggy/moist) but most people prefer to keep the nori as crisp as possible.You can buy this onigiri plastic wrapper, which allows you to keep the nori crispy until you’re ready to eat (similar to Japanese convenience store-style onigiri). Or, check the video below to see how you can make a DIY plastic wrap.

Cooking Tips and Techniques

Frequent Asked Questions

Why does my nori get soggy and wet?

Nori gets soggy as soon as it absorbs moisture. If you prefer crispy nori for your onigiri, I recommend wrapping the nori right before you eat. Make sure the nori is kept in a resealable bag to avoid getting stale.

Why does my nori get gummy?

I recommend getting better quality nori, preferably imported from Japan. It’s very unfortunate but most nori available in grocery stores here is not flavorful and the texture tends to get gummy when wet/moist. I always get imported nori from Japan (I usually pick the most expensive nori at Nijiya Market) and it’s pretty good. We can get better quality nori in Japan at a decent price, but not outside of Japan yet.

Do I have to make onigiri right before I pack for lunch?

If you want to make onigiri for lunch the next day but don’t want to wake up early, here’s my tip. You can wrap the finished onigiri (in plastic wrap) with a thick kitchen towel. The kitchen towel protects the rice balls from being too cold in the refrigerator. Rice gets hard in the refrigerator but with this easy trick, your onigiri will be cool enough to stay safe.

Do you serve onigiri cold?

You can enjoy onigiri warm or at room temperature, so they’re perfect in your lunchbox or as a portable snack on the go. You can even plate them up as a tasty appetizer!

Do you think I can involve my children in making rice balls?

Yes! The best part about making onigiri at home is you can always engage your little ones as their ‘craft day in the kitchen.’ Make it fun and enjoyable! You can use this onigiri mold to make it easier to create a triangle shape.Like everything else, practice makes perfect when it comes to making onigiri. For a visual guide, you can watch my video and see the step-by-step instructions below.

Is onigiri sushi?

For the uninitiated, onigiri is sometimes misunderstood as a type of sushi but they are not.One of the key differences between onigiri and sushi is that onigiri starts from a base of plain steamed rice, while sushi is made of Sushi Rice (steamed rice seasoned with vinegar, salt, and sugar).?? See more details in How To Cook Japanese Rice and How To Make Sushi Rice.

Where can I get onigiri?

Outside of the home, you can literally find rice balls everywhere in Japan: konbini convenience stores, airports, cute cafes, and specialty stores. Here in the US, you can find them at Japanese grocery stores.

More Onigiri Recipes and Variations

We also enjoy onigiri in these popular variations:Wish to learn more about Japanese cooking? Sign up for our free newsletter to receive cooking tips & recipe updates! And stay in touch with me on Facebook, Pinterest, YouTube, and Instagram.Editor’s Note: The post was originally published on September 5, 2012. It was updated with more helpful content and new step-by-step and final images on September 10, 2023. The post was republished with a new video on May 10, 2024.