MOS Burger is launching a new summer menu item, the Avocado Tacos Burger, available nationwide in Japan from July 15 to early September 2026. This new burger adds creamy avocado to the popular tacos burger lineup, promising a refreshing flavor to beat the summer heat.
For visitors to Japan, this seasonal release highlights MOS Burger’s unique take on tacos-style burgers, blending Japanese flavors with fresh ingredients. The addition of avocado and a wedge of lemon allows customers to customize their taste experience, making it an appealing choice for those seeking light yet flavorful fast food during the warm season.
About MOS Burger’s Summer Tacos Burger Lineup
Last summer, MOS Burger sold over 3 million units of its Mostacos Burger and Spicy Mostacos Burger, which feature a special tacos sauce with miso for a balanced, savory flavor. Building on that success, the new Avocado Tacos Burger adds sliced avocado and cheddar-based cheese to the patty, along with tomatoes, onions, and a half-mayo dressing. Customers can squeeze the included lemon wedge for a fresh, zesty kick.
Alongside the new avocado option, MOS Burger has improved the original Mostacos Burger and Spicy Mostacos Burger by switching to a cheddar-based sliced cheese, enhancing the richness and harmony of flavors between the tacos sauce, cheese, and fresh ingredients. The Spicy Mostacos Burger includes jalapeño for a mild spicy heat, while the regular Mostacos Burger is mild and suitable for those who prefer less spice.
Highlights
- New Avocado Tacos Burger priced at ¥630, featuring avocado, cheddar cheese, tomato, onion, and tacos sauce with half-mayo dressing.
- Refreshed Mostacos Burger (¥570) and Spicy Mostacos Burger (¥620) with richer cheddar cheese flavor.
- All burgers use calorie-half mayonnaise for a lighter taste.
- Double patty options available for all three burgers.
- Available at most MOS Burger locations across Japan from July 15 to early September 2026.
Menu & Event Details
| Item | Details |
|---|---|
| Name | MOS Burger Avocado Tacos Burger and Tacos Burger Lineup |
| Menu / items | Avocado Tacos Burger, Mostacos Burger, Spicy Mostacos Burger (all with double patty options) |
| Location | MOS Burger restaurants nationwide, Japan |
| Address | 2-15-19 Kami-Osaki, Shinagawa-ku, Tokyo |
| Period | July 15, 2026 – Early September 2026 |
| Release date | July 15, 2026 |
| Price | Avocado Tacos Burger ¥630; Mostacos Burger ¥570; Spicy Mostacos Burger ¥620 (all tax included) |
