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 of garlic paste and garlic powder with a peppery kick of black pepper for an irresistibly appetizing flavor. On the “Big Mouth Dirty” burgers, the sauce is added twice — both above and below the fillings — so it oozes out with every single bite.
Two New Burgers
Double Beef & Hash Big Mouth Dirty
A crispy, fluffy hash brown is sandwiched between two flame-grilled 100% beef patties, topped with two slices of cheddar cheese and accenting pickles. With creamy mayo sauce and the Special Garlic Mayo Sauce spilling out, it is a hearty, satisfying double beef burger.
Beef & Chicken Big Mouth Dirty
This burger stacks a flame-grilled 100% beef patty and a juicy chicken patty with a crispy exterior, together with two slices of cheddar cheese, an authentic chili beans sauce seasoned with chili powder and cumin, fresh onion, and pickles. It is a large, authentic burger that lets you enjoy both beef and chicken.
Product Details
- Double Beef & Hash Big Mouth Dirty: ¥1,490 (single) / ¥1,790 (set)
- Beef & Chicken Big Mouth Dirty: ¥1,490 (single) / ¥1,790 (set)
- On sale: From Friday, July 3, 2026 — limited time only
*Sets come with French fries (S) and a drink (M). *All prices include tax. *Not available at some outlets, including the Tokyo Racecourse, Kyoto Racecourse, and Kansai International Airport Terminal 1 locations.
Also Launching: King Fusion Chocolate & Brownie Sundae
Also from Friday, July 3, 2026, the popular King Fusion sundae series adds the Chocolate & Brownie Sundae (¥490) for a limited time. Smooth soft serve is paired with silky chocolate sauce and topped with a rich, crunchy chocolate brownie bursting with cacao flavor — an irresistible treat for chocolate lovers. *Limited quantities; available while supplies last. Not available for delivery.
Summary
Whether you are a fan of the Big Mouth series or simply love a satisfying burger, these new arrivals are not to be missed. Open wide and enjoy the punchy, garlic-mayo-oozing goodness of Burger King’s latest big burgers.