What Is Onigiri? History, Classic Fillings, How to Make It, and Where to Buy It
Both an everyday staple and something special to Japanese people, onigiri is a traditional food that represents Japanese culinary culture.
Easy to make and convenient to carry, these rice balls are eaten in many settings, from packed lunches to emergency meals.
Part of their appeal lies in the endless variations possible through different fillings and ways of shaping the rice.
This article introduces onigiri, its history, and how to make it, along with popular fillings and distinctive regional varieties.
Read on to understand the connection between Japanese people and onigiri.
What Is Onigiri?
Onigiri is a traditional Japanese food made by sprinkling white rice with salt, shaping it by hand, and wrapping it in nori seaweed.
It is also known as nigirimeshi or omusubi.
Onigiri is usually triangular and often contains a filling such as umeboshi (pickled plum) or kombu kelp.
There are several theories about the origin of its triangular shape, with one leading explanation linking it to offerings to the gods.
People once believed that gods dwelled in high places, such as mountains, and are said to have shaped rice like mountains before eating it.
The nori wrapping helps keep hands clean while adding saltiness and aroma to enhance the flavor.
However, onigiri continues to evolve in different regions, households, and businesses, so barrel-shaped and cylindrical versions, as well as those without nori, are not uncommon.
The range of fillings has also expanded, making onigiri a food that reflects changing times.
Long familiar and beloved, onigiri is something of a cornerstone of Japanese food culture.
Simple and easy to carry, it also has a special ability to evoke personal memories and nostalgia, offering a sense of comfort.
The History of Onigiri
The exact origins of onigiri are uncertain, but the following timeline traces its history.
- Jomon period (approximately 18,000–300 BCE)
- Rice cultivation is believed to have been introduced to Japan.
- Yayoi period (300 BCE–300 CE)
- A carbonized lump of rice known as chimaki, considered a precursor to onigiri, was discovered at an archaeological site from this period. Some regard it as the oldest onigiri.
- Nara period (710–794)
- The text Hitachi no Kuni Fudoki contains a reference to nigiriii, or hand-shaped rice.
- Heian period (794–1185)
- Tonjiki, made by pressing steamed glutinous rice into a firm shape, was served at celebrations and other occasions.
- Kamakura period (1185–1333) and Sengoku period (1467–1590)
- Onigiri with umeboshi fillings appeared and became valued as provisions for warriors.
- Edo period (1603–1858)
- Onigiri spread throughout Japan, becoming a useful portable food and packed-lunch staple among ordinary people. This established the form of onigiri familiar today.
- Showa period (1926–1989)
- 7-Eleven introduced convenience-store onigiri in 1978, and it gradually became part of everyday life.
- Today
- Onigiri has become a food loved around the world under the name "ONIGIRI."
Classic Onigiri Fillings
Of the many kinds of onigiri, here are 5 classic fillings.
Trends change over time, but these favorites have remained popular with both adults and children.
They are also easy to find, so if you are trying onigiri for the first time, use the descriptions below to help you choose.
1. Salmon Onigiri
Salmon onigiri, filled with grilled salmon or salmon flakes, has long been a familiar favorite.
The sweetness of the rice pairs well with the salmon's balanced saltiness, while its tender texture brings out the savory flavor.
Its grilled aroma whets the appetite, and it is substantial enough to leave you satisfied.
High in protein and low in calories, salmon is also a good choice for nutritional balance.
It combines well with other ingredients to create different flavors, resulting in many variations.
2. Tarako Onigiri
Tarako onigiri is filled with tarako, salted fish roe usually from Alaska pollock.
Preparation varies by shop, and labels often specify whether the roe is grilled, raw, or aged, as in "grilled tarako onigiri."
Its balance of savory flavor and saltiness makes it especially flavorful, while the tiny eggs give it a distinctive popping texture.
If you prefer a little heat, try mentaiko onigiri, filled with tarako seasoned with chili peppers and other seasonings.
3. Umeboshi Onigiri
As its name suggests, umeboshi onigiri is filled with pickled plum and keeps well.
It has a long history dating back to the Kamakura period, and umeboshi remains a familiar filling loved by Japanese people of all ages.
Its distinctive, strong tartness gives it a refreshing taste that does not sit heavily in the stomach.
Another appeal is that the plum's seasoning can be adjusted to suit different tastes.
With fatigue-relieving and antibacterial properties, it is recommended when you feel unwell or have little appetite.
4. Kombu Onigiri
Kombu onigiri is filled with kombu, a type of kelp.
Although it is a well-known filling, it tends to seem plain and rarely takes center stage, yet it has a devoted following.
It pairs well with nori, another type of seaweed, filling your mouth with ocean aromas and savory flavor.
Its firm, pleasantly chewy texture is another defining feature, with the flavor deepening as you chew.
Kombu is rich in minerals, including calcium and iron, and eating it can also help support gut health.
5. Tuna Mayo Onigiri
Tuna mayo onigiri is filled with tuna mayo, a mixture of tuna, usually packed in oil, and mayonnaise.
It is also called "Sea Chicken."
A long-standing convenience-store staple, it remains an overwhelmingly popular onigiri filling.
Its mild, creamy flavor is easy to enjoy for everyone from children to older adults.
The tuna and mayonnaise bring out each other's tanginess, richness, and savory notes, while the sweetness of the rice makes the combination especially delicious.
Regional Onigiri Varieties
Onigiri is strongly influenced by local characteristics and customs, and regional varieties across Japan reflect their area's food culture and identity.
Here are 5 particularly distinctive examples.
Unlike classic onigiri, these varieties are less commonly found and have individual flavors, so try them if you have the chance.
1. Ebi Tenmusu
Ebi tenmusu is a bite-sized onigiri filled with a single small shrimp tempura, making it easy to eat.
The rice is shaped around the shrimp, with the tail sticking out for a look that sets it apart from ordinary onigiri.
It originated as a staff meal at a sushi restaurant in Mie Prefecture, but today it is known as a specialty of Nagoya in Aichi Prefecture.
The springy texture and flavor of the shrimp pair wonderfully with the tempura batter and sauce-infused rice.
Because it retains its flavor well over time, it is also a welcome gift or food to bring someone.
2. Kensayaki
Kensayaki is a regional specialty of Niigata Prefecture: a round, grilled onigiri coated in sweet miso or ginger miso.
Its name is said to come from the Sengoku-period warlord Uesugi Kenshin, who ate it as a military ration. It is also called kenshinyaki or kensashiyaki.
The rich aroma of toasted miso, accented with green onion or ginger, makes it an appetizing treat.
Wholesome and easy to make, it is also popular as a snack or late-night meal.
3. Mezashi Onigiri
Mezashi onigiri is a representative onigiri of Chiba Prefecture.
A whole mezashi, a dried fish usually made from sardine, is wrapped in rice, giving it a shape similar to ebi tenmusu.
Mezashi onigiri, however, makes an even stronger visual impression.
The fish's salty, savory flavor is followed by a distinctive bitterness that highlights the sweetness of the rice, creating a taste more suited to adult palates.
Simple yet healthy and nutritious, it is also a good choice for health-conscious eaters.
4. Kashiwa Onigiri
Kashiwa onigiri is made with kashiwameshi, a regional dish from Fukuoka Prefecture consisting of rice cooked with chicken.
The name comes from kashiwa, a long-used word for chicken in the Kyushu region.
In Tokyo, it is often sold as tori gomoku.
Along with chicken, it usually contains ingredients such as carrots, burdock root, and shiitake mushrooms, seasoned with soy sauce, mirin, and sake.
The chicken's savory flavor deepens as you chew, pairing with the gently sweet rice for a comforting taste that feels nostalgic.
5. Benkeimeshi
Benkeimeshi is a regional specialty of the Shonai area of Yamagata Prefecture.
It consists of a grilled miso onigiri wrapped not in nori, but in another local specialty: seisaizuke, Yamagata mustard greens pickled in soy sauce.
Its round shape and deep green color may make it difficult to recognize as onigiri at first glance.
The crisp texture and mild peppery bite of the greens define benkeimeshi, giving it an irresistibly moreish flavor.
How to Make Onigiri
Anyone can easily make onigiri with rice, salt, a favorite filling, and nori.
The guide below outlines the basic method and tips for making it well.
Use it as a reference and try making your own onigiri.
- 1. Cook the rice
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• Rinse the rice quickly, then soak it thoroughly for about 1 hour.
• Use a little less water when cooking so the rice turns out slightly firm. - 2. Spread out plastic wrap and sprinkle it with salt
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• Use less salt if you will eat the onigiri right away, and salt it more generously if you will eat it later.
• Always use a fresh piece of plastic wrap to prevent bacterial growth. - 3. Place nori on the plastic wrap and add rice
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• If using freshly cooked rice, let excess heat and moisture escape first.
• Use roughly half a rice bowl of rice as a guide. - 4. Place your chosen filling on the rice and shape the rice around it
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• Shape it gently without squeezing too hard.
• Placing the filling in the center helps keep the onigiri from falling apart. - 5. Form it into a triangle to finish
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• For crisp nori, wrap it around the rice just before eating rather than in step 3.
• You can also choose a different shape if you prefer.
Convenience Stores and Station Kiosks: An Easy Way to Try Different Onigiri
Onigiri is easy to find everywhere, from neighborhood supermarkets to kiosks inside train stations.
Convenience stores are probably the quickest option.
Alongside the classics, they offer a wide range of less traditional choices, such as fried rice, curry, and Japanese fried chicken.
There are also premium varieties made with carefully selected ingredients and limited-time options, making even a look at the shelves enjoyable.
With affordable prices of around ¥110–¥300 and stores generally open 24 hours a day, year-round, onigiri is a handy travel companion.
It suits all kinds of situations: breakfast, a light snack, a quick energy boost, or a meal during a Shinkansen ride.
Some convenience stores have seating areas, so you can also use them as a place to stop for breakfast.
Visit an Onigiri Specialty Shop for an Authentic Taste
There are also specialty shops serving carefully crafted onigiri.
These shops take a distinct approach to ingredients—rice, fillings, seasonings, and nori—and preparation, including how the rice is cooked and shaped, how ingredients are combined, and how much seasoning is used.
Today, the 2 main formats are dine-in shops, where onigiri is served on-site, and takeout shops.
They are also popular with international visitors looking for an authentic taste of onigiri, so consider stopping by one.
- Dine-in
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• Watch onigiri being made in front of you and eat it freshly prepared.
• Try each shop's accompanying dishes, such as miso soup and pickles. - Takeout
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• Eat wherever and whenever you like.
• A convenient option when you are short on time or want to share with others.
Frequently Asked Questions About Onigiri
Q
What kinds of onigiri are there?
Onigiri comes in a huge variety of fillings and shapes. The classic version is made with salted white rice, shaped by hand into a triangle, and wrapped in nori.
Q
What fillings are used in onigiri?
Classic fillings include salmon, tarako, and umeboshi. There are also many other fillings, such as shrimp tempura, with choices varying widely by region and shop.
Summary
Onigiri served as military provisions in the Kamakura period and as a portable food in the Edo period.
Today, Japanese people still eat it in many situations, whether they are a little hungry, short on time, or dining outdoors.
For many Japanese people, onigiri likely comes to mind as something to eat while traveling.
Since it is readily available at convenience stores, be sure to try onigiri when you visit Japan.
Have fun comparing varieties with different fillings and shapes, too.