Burger King Japan Launches New “Big Mouth Dirty” Burgers Oozing Special Garlic Mayo Sauce — On Sale July 3 for a Limited Time
Key Takeaways: Burger King Japan adds two Big Mouth Dirty burgers on July 3, 2026, each ¥1,490 on its own or ¥1,790 as a set. The new Special Garlic Mayo Sauce is layered twice, above and below the fillings, so it spills out with every bite. A Chocolate & Brownie Sundae joins at ¥490 for a limited time. Operated by BK Japan Co., Ltd., Burger King® will launch two new burgers on Friday, July 3, 2026, as the “Dirty” addition to its hugely popular Big Mouth series: the Double Beef & Hash Big Mouth Dirty and the Beef & Chicken Big Mouth Dirty. Both feature the punchy new Special Garlic Mayo Sauce oozing out of flame-grilled 100% beef patties layered with rich cheese, available for a limited time. The New “Special Garlic Mayo Sauce” The star of these burgers, the newly developed Special Garlic Mayo Sauce, combines the bold savoriness […]

