Japan’s hamburger chain “Mos Burger” and “San-shin,” a manufacturer known for unique rice snacks, have collaborated. This noteworthy new product will be released in Japan starting Monday, February 2, 2026.
The product name is “Lucky Mayonnaise Okaki Teriyaki Burger Flavor.”
Pre-sales for this product have begun at 7-Eleven stores nationwide in Japan. It is scheduled to be sold at general supermarkets starting in April 2026. It takes the surprising approach of recreating the taste of the long-loved “Teriyaki Burger” with crunchy “Okaki” (rice crackers).
While the package has a strong impact, the most intriguing aspect is how faithfully the taste has been reproduced.
Condensing the Taste of the “Originator” with 53 Years of History into a Snack
The protagonist of this collaboration is the “Teriyaki Burger,” which can be called synonymous with Mos Burger.
This menu item actually has a deep history. In 1973, Mos Burger was the first hamburger chain in Japan to sell a “Teriyaki Burger.” They fused the traditional Japanese tastes of soy sauce and miso with the Western hamburger.
Since then, this product has been loved for a long span of 53 years, making it truly worthy of being called the “Originator” of Japanese-style burgers.
The Components of Flavor
The appeal of the original “Teriyaki Burger” lies in its exquisite balance of flavors.
- Teriyaki Sauce: A rich, sweet and savory soy sauce-based sauce that resonates deeply with the Japanese palate.
- Mayonnaise: Acidity and richness that mellows the intensity of the sauce.
- Lettuce: A crisp textural accent.
The harmony created by these elements uniting is the reason it has been supported for over half a century. In this “Lucky Mayonnaise Okaki,” this complex yet royal road flavor is expressed on the completely different stage of rice crackers.
Powerful Chemical Reaction with the Popular “Lucky Mayonnaise” Series
The collaboration partner, San-shin Co., Ltd.’s “Lucky Mayonnaise Okaki,” is also a popular series with deep-rooted fans in Japan. Known as a rice cracker with a distinct mayonnaise flavor, it has an addictive quality that makes it hard to stop once you start eating. You may have seen the yellow package depicting a loose, relaxed character.
In this “Teriyaki Burger Flavor,” the “mellow richness” possessed by this Lucky Mayonnaise plays an important role.
“Burger Feel” Locked into a Crunchy Texture
The development point lay in condensing the “richness and savoriness of sweet and spicy teriyaki sauce,” imaged after the Teriyaki Burger, into the okaki dough.
Usually, hamburgers are tasted along with the fluffy texture of the bread (bun). However, this time it is an okaki with a “crunchy texture.” The specific mellowness of Lucky Mayonnaise is added to this. It is said that the satisfaction the moment you take a bite feels just like eating a Teriyaki Burger itself.
Since the “Originator of Japanese-style burgers” and a “famous mayonnaise okaki brand” have teamed up, we can expect an authentic taste that goes beyond mere buzz creation.
Sales Schedule and Where to Buy
Release dates for this product differ by sales channel. It will start first at convenience stores (Konbini).
Pre-sale (7-Eleven)
- Release Date: Sequentially from Monday, February 2, 2026
- Available Stores: 7-Eleven stores nationwide in Japan
General Sale
- Release Date: Sequentially from Monday, April 6, 2026
- Available Stores: Retail stores such as supermarkets and drugstores nationwide in Japan
Important Note: This product will not be sold at Mos Burger restaurant locations. Even if you go to Mos Burger thinking to buy it with a hamburger, you cannot get it. Please check your nearest 7-Eleven first.
Detailed Product Information
The size and pricing, which are easy to enjoy, are also attractive. It is suitable as a souvenir.
- Product Name: Lucky Mayonnaise Okaki Teriyaki Burger Flavor
- Manufacturer’s Suggested Retail Price: 150 yen (excluding tax) (approx. $1.00 USD)
- Content: 30g (approx. 1.05 oz)
- Manufacturer: San-shin Co., Ltd.
A Proposal for a New “Teriyaki” Experience
The Teriyaki Burger, with over 50 years of history, has changed its form and appeared as “Okaki.”
It becomes an excellent choice as a snack between work or as a companion for relaxing time in a hotel room. In particular, the combination of sweet and spicy flavors with mayonnaise holds high potential as an appetizer for alcohol such as beer or highballs, not to mention Japanese tea (Green Tea). The single-serving size of 30g is also perfect for a trial taste during travel.
This is a must-try item not only for Mos Burger fans but also for those looking for unique Japanese snacks. Please look for the package with that familiar logo on the shelves of 7-Eleven.
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