
One of Japan’s most loved snack foods has got to be onigiri. Both a staple of mom’s home cooking and convenience store cuisine, these little balls of rice wrapped in seaweed come in enough flavors and styles to satisfy everyone. They’re even so delicious they have driven some people to armed robbery.
Personally during these summer months these rice balls are especially satisfying. They’re good because in this intense heat it can be hard to stomach greasier fare like cheeseburgers.
However, now Circle K Sunkus stores have stocked themselves with a Bakudan Musubi Bacon Cheese Hamburg (Pepper Mayo Included). Containing everything in the title and then some, I didn’t hesitate to grab one of these curiosities and try it out.
■ Onigiri
For those uninitiated with onigiri, they are usually palm sized clumps of rice filled with some delicious ingredients. These fillings can be anything like pickled plum, salmon, fried chicken, shrimp, tuna, kimchi, or a hardboiled egg to name only a few.
They’re usually wrapped in seaweed. To give a sense of scale for later, I also picked up one of my favorite Sunkus varieties of onigiri, the Negitoro Wasabi. It’s a spicy sauce blend with a little bit of chopped green onion.
A lot of convenience store onigiri like to keep the seaweed dried and crispy so they’re wrapped in such a way that the seaweed does not touch the rice until opening. This packaging can be daunting for a first time eater, but it’s pretty easy once you get the hang of it. Just follow the numbers.
Other rice balls are wrapped with the seaweed touching the rice. This makes it soft, moist, and much more straight forward to open. The Bakudan Musubi is one such onigiri.
■ Bakudan Musubi Bacon Cheese Hamburg (Pepper Mayo Included)
The Bakudan Musubi is unique in a few ways. First it’s considerably more expensive. Generally an onigiri will run you between 100 and 130 yen (US$1 -$1.27), but this one will cost you 298 yen ($2.92). That being said you get about that much more in filling volume.
“Pepper Mayo, Sunny Side Up Style Egg, Cheese, Hamburger, Bacon”
Secondly, this bacon cheeseburger onigiri is microwaveable. Considering what’s inside this seems reasonable but a little odd for these snacks which are usually ready to eat upon purchase. The label above also advises heating for 45 seconds in a 500W microwave.
I heated it to the recommended time and it came out feeling comfortably toasty to the touch. Unfortunately, it probably could have used another five or ten seconds as the inside was a little clammy. Still the ingredients were pretty good all crammed inside the swollen ball of rice. The beef patty was probably the weakest part. It was a slightly gelatinous wad of meat that you might expect from a convenience store, but since this was an ensemble cast of fillings the beef played its supporting role well enough.
The real stars of this flavor packed show were the fried egg and pepper mayonnaise. The egg was cooked just right and nicely runny. The runny yolk ran throughout the rice without making a mess. It also melded with the peppery mayonnaise for a spicy, creamy, and sweet taste all accentuated with the salty seaweed wrapping. The egg and mayo truly elevated the Bakudan Musubi from a mediocre burger to a unique and pretty cool rice ball.
If I had one complaint it would be that the pepper mayo wasn’t evenly distributed inside my onigiri. I didn’t really get the full effect until the final few bites. Otherwise it was a good snack… or meal. I wasn’t really sure which it was meant to be. Although by itself the Bakudan Musubi looks and feels big, when put next to a regular onigiri, it’s actually not insanely large. If you’re planning to have one for a meal you may want to get two or perhaps a sizeable side dish.
Photos: RocketNews24










The best-selling rice ball at Family Mart is…SPAM onigiri?
Family Mart to celebrate 40th birthday by introducing onigiri with eco-friendly packaging
Onigiri taste test: Which convenience store will win?
Should you warm up your convenience store onigiri rice balls in the microwave?【Taste test】
Pokémon Poké Ball rice balls now on sale in Japan, don’t taste like jelly donuts【Taste test】
Highest Starbucks in Japan set to open this spring in the Tokyo sky
Survey finds that one in five high schoolers don’t know who music legend Masaharu Fukuyama is
“Let’s Speak North Korean!”
Japanese Prime Minister once criticized deploying military to fight Godzilla
Foreign tourists in Japan will get free Shinkansen tickets to promote regional tourism
Saitama is home to the best strawberries in Japan that you’ve probably never even heard of
Anime holy ground – A visit to the real-world location of Look Back【Photos】
Support Japan’s real-world Totoro Forest with special Studio Ghibli collection
Tokyo Skytree turns pink for the cherry blossom season
Mr. Sato taste tests not only the original takoyaki, but its predecessor, radioyaki, in Osaka
The 10 most annoying things foreign tourists do on Japanese trains, according to locals
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Naruto and Converse team up for new line of shinobi sneakers[Photos]
Is Sapporio’s Snow Festival awesome enough to be worth visiting even if you hate the snow? [Pics]
Japan has trams that say “sorry” while they ride around town…but why?
Sakura Totoro is here to get spring started early with adorable pouches and plushies
Poop is in full bloom at the Unko Museums for cherry blossom season
Shibuya Station’s Hachiko Gate and Yamanote Line stairway locations change next month
Japan’s new “Cunte” contact lenses aren’t pronounced like you’re probably thinking they are
Japan’s newest Shinkansen has no seats…or passengers [Video]
Foreigners accounting for over 80 percent of off-course skiers needing rescue in Japan’s Hokkaido
Super-salty pizza sends six kids to the hospital in Japan, linguistics blamed
Starbucks Japan unveils new sakura Frappuccino for cherry blossom season 2026
Take a trip to Japan’s Dododo Land, the most irritating place on Earth
Is China’s don’t-go-to-Japan warning affecting the lines at a popular Tokyo gyukatsu restaurant?
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
The 10 best types of onigiri rice balls to try in Japan【Survey】
Japan Railways recently revealed ramen-style rice balls in its convenience stores
Cutest rice balls ever? Adorable new onigiri shop opening in downtown Tokyo【Photos】
Make your best-tasting onigiri taste even better with this easy recipe! 【RocketKitchen】
The difference between onigiri rice balls in Tokyo and Osaka
How to make Japan’s coolest summer snack: Onigirazu! 【Recipe & Video】
Survey ranks convenience store rice balls – salmon, sea-dwelling poultry & plants steal the show
Around Japan in 47 rice balls: Mr. Sato buys each prefecture’s musubi all from one Tokyo shop
Shinagawa Station sells unappetizing fish butt onigiri, netizens nauseated
It’s a Japanese boxed lunch in the palm of your hand with the new bento rice ball
Okinawan soul fool Pork Tamago Onigiri sold not at a five-star restaurant, but at an airport
Will frozen bento onigiri be Japan’s next big convenience store food trend?【Taste test】
Sushi and onigiri rice balls get a new look with rollable furikake
What are Japan’s best, and most unique, regional rice balls?
Onigiri without the nigiri – Japan’s traditional rice balls get an update