
Despite Japan’s image as a country where people mainly eat fish and pickled vegetables, the truth is the country has some serious carnivorous tendencies. Aside from scores of independent hamburger joints, you’ll find branches of McDonald’s and Burger King, along with home-grown chains such as First Kitchen and MOS Burger.
MOS Burger’s name becomes less intimidating, if no less nonsensical, when you find out it stands for “Mountain Ocean Sun” burger. With over 1,000 locations across Japan and a reputation for high-quality ingredients, MOS has legions of fans, so it was big news when the company announced a major change to its burgers.
Like many other Japanese burger establishments, MOS used a mixture of pork and beef in their patties. That changed on April 23 when the chain’s burgers became all-beef, topped with a redesigned special sauce. But as New Coke and the Ford Mustang II taught us, newer isn’t always better. To put MOS’s new offerings to the test, we dispatched our team for a late-night back-to-back burger binge.
To try out the new patties as quickly and thoroughly as possible, we dispatched our hungry team of reporters to multiple 24-hour MOS Burger locations on the night of the April 22 to snag sandwiches with the old patties. After making sure that the new patties would be available at 12 a.m., we patiently waited, stomachs growling, until we could begin our test at the stroke of midnight.
In the name of science, we ordered up a regular burger, a tobikiri (“gushing”) cheese burger, and a double cheese burger, all of which use the new patties. Resisting the urge to plow right into our meal, we first performed a visual check. The new patties seem to be cooked a little more well-done than the old ones, but aside from that we couldn’t spot any differences.
▼Old MOS burger (left) and new (right), with their tasty sauces:
▼Old and new tobikiri cheese burgers, both delicious:
▼Old and new double MOS cheese burgers, where we really noticed the new flavor:
With visual comparisons out of the way, we dug in. So how did we feel after eating our six burgers, other than stuffed?
Sorry MOS, but your new patties just can’t top the old version. Not only were the mixed pork/beef patties juicier, they had a certain mild suppleness in flavor that’s lacking from the all-beef ones.
Aside from the tiny loss of juice and a slightly harsher flavor, the new patties also have a slightly rougher texture. We know we’re nitpicking here, but individually, none of these are anything to have a cow over. They’re all annoyances though, and we didn’t have to put up with them with MOS’s old patties. Three tiny complaints might not seem like much, but since we had none before, we can’t help but notice them all the more.
The new burgers’ buns and other ingredients are the same high quality we’ve come to expect from MOS, but that still doesn’t make up for our disappointment over the patties. The nail in our sacred cow’s coffin was that the new sandwiches just don’t have the wonderful interplay of flavors with the sauce like the old ones did. More than anything, that was what made a MOS burger a MOS burger, and without it the whole experience suffers.
Don’t get us wrong, though. This is still MOS we’re talking about, and their burgers remain in the top class of Japanese chains. Putting aside our patty preferences, we have a serious soft spot for the tobikiri cheese burger. It may look like an ordinary old cheeseburger, but the flavors of the cheese and patty swirl together for a great one-two punch. But with great food comes great responsibility, and we expected just a little more.
We realize there’s no accounting for individual taste, though. We’re so convinced the new burgers are a step down that we can’t imagine we’re alone in our opinion, but we still recommend trying one for yourself, preferably a double with two patties so you can get a real feel for the new flavor.
Photos: RocketNews24
[ Read in Japanese ]




Mos Burger’s new luxury burger contains 0.18 percent alcohol
Ooh la la! MOS Burger’s new premium hamburger packs a sophisticated punch
Mos Burger brings back its hugely popular “White Mos Burger”, but is it any good?
Japan’s new sukiyaki burger tops your burger with more beef all winter long
Mos Burger’s new “Tobikiri Avocado Croquette Burger” teaches us how great potatoes are
Japan’s real-world Pokémon hot spring’s first photos are here![Photos]
Two new Sailor Moon art manhole covers are coming to Usagi’s real-world Tokyo neighborhood
KFC Japan’s “The American Burgers” include a pile of guilt
What makes the Starbucks Japan chocolate terrine so popular?
Gundam teams up with 300-year-old daruma maker for wood-carved anime mecha figures[Photos]
Krispy Kreme releases new limited-edition fox doughnuts at only four stores in Japan
Government says 5.7 trillion yen of Japanese media was pirated last year, thinks AI could help
2021 Salaryman Poetry Battle showcases some dark but hilarious poems
Japanese government to allow desecration of flags on kids’ meals
Japan’s izakaya pubs closing at record pace, failing to attract foreign tourists
Kanji ice cream becomes a sell-out hit in Japan
Japan has a new cute and clever sunblock for cat lovers
Tokyo’s new extra-expensive ramen restaurant is dividing opinions, so we tried a bowl
Japanese temple burns to the ground, fire burning inside for 1,200 years unharmed
Japan’s instant ramen snack theme park features an athletic course even adults can enjoy
Krispy Kreme Japan is bringing two special donuts to the most-forgotten big city in the country
Pizza Hut Japan’s drinkable curry pizza is here – Is it all we dreamed it would be?[Taste test]
Starbucks Japan hoping fans will go bananas for its new mottainai banana affogato Frappuccino
Tokyo’s life-size Gundam anime mecha statue will be removed this summer
The average age of Japan’s hikikomori shut-ins is getting older, survey shows
Japan enters Golden Week vacation period, survey shows one in three plan to ride it out at home
Ichiraku Ramen-inspired ramen sets from Naruto anime pay homage to Naruto, Sasuke, and Sakura
Japan’s new Pokémon jackets give you the look and powers of the Kanto starter trio
Japan now has gyoza doughnuts, and they taste like no other doughnut we’ve tried before
Studio Ghibli releases new anime keychains that are like miniature figurines
This Tokyo Station sweets sensation sells out daily, but we finally got our hands on it
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
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
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
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
Japan’s 5.3 million beautiful Hitachi Nemophila flowers are now in full bloom[Photos]
Mos Burger poster ad looks curiously more like a Furby than actual food
Mos Burger releases new gummi candies in Japan
Mos Burger’s new Mac and Cheese burger: Does it taste as good as it looks?
New Mos Burger restaurant serves alcohol, gourmet meals and a burger made from a whole tomato
It’s the end of the line for Mos Burger’s monstrously meaty Niku Niku Niku Burgers
We combine McDonald’s and MOS Burger for forbidden deliciousness
Is Lotteria’s new meat sauce burger a challenge to the reign of Mos Burger’s Japanese classic?
Japan’s Mos Burger discontinues old teriyaki burger and rolls out new recipe, but is it as good?
Japan’s MOS Burger replaces hamburger buns with lettuce for limited “Natsumi” range
Mos Burger’s sauce-soaked Wet Burger sure is wet, but is it worth your burger bucks? 【Taste test】
Katsu curry rice you can eat with your hands? Mos Burger unveils new Rice Burger Katsu Curry
Mos Burger fries up an unusual fusion with Tempura Rice Bowl Burgers
Mos Burger opens new online store dedicated just to frozen rice burger bulk buys
Mos Burger Goes Green With Their Mos Natsumi Burgers
Food Fight! Mos Burger to Take on McDonald’s in the Breakfast Arena
Mos Burger adds new plant-based vegan teriyaki burger to its menu