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Burger King Japan launches Autumn Special Mushroom Whopper series
BK Japan is releasing three new limited-time products as part of its Mushroom Whopper series starting October 23, 2026. The new lineup includes the Autumn Special Mushroom Whopper, the Autumn Special Double Mushroom Whopper, and the Autumn Special Mushroom Whopper Jr.
The new burgers feature flame-grilled 100% beef patties paired with four types of mushrooms: two varieties of roasted mushrooms, king oyster mushrooms, and shimeji mushrooms. A key component of the new series is the ‘Original Herb Sauce’, which combines oregano and thyme with a spicy accent.
From October 23 to October 29, Burger King will hold a promotional campaign offering discounts on Mushroom Whopper sets. Selected sets will be discounted by up to 300 yen (approximately 23%), while Jr. size sets will receive a 100 yen discount.
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What the coverage asserts, and how many sources carry each claim.
- [○ 1 SOURCE] Jr. size sets will receive a 100 yen discount during the promotion. game.watch.impress.co.jp
- [● 3 SOURCES] The Autumn Special Double Mushroom Whopper single item is priced at 1,440 yen. www.gourmetbiz.net · game.watch.impress.co.jp · prtimes.jp
- [● 3 SOURCES] The products feature an ‘Original Herb Sauce’ containing oregano, thyme, and spicy elements. www.gourmetbiz.net · game.watch.impress.co.jp · prtimes.jp
- [○ 1 SOURCE] Mushroom Whopper sets will be discounted by up to 300 yen during the promotion. game.watch.impress.co.jp
- [● 3 SOURCES] BK Japan is releasing three new Mushroom Whopper products on October 23, 2026. www.gourmetbiz.net · game.watch.impress.co.jp · prtimes.jp
- [○ 1 SOURCE] A promotional campaign will run from October 23 to October 29. game.watch.impress.co.jp
- [● 3 SOURCES] The new burgers use four types of mushrooms including roasted mushrooms, king oyster mushrooms, and shimeji mushrooms. www.gourmetbiz.net · game.watch.impress.co.jp · prtimes.jp
- [● 3 SOURCES] The Autumn Special Mushroom Whopper single item is priced at 990 yen. www.gourmetbiz.net · game.watch.impress.co.jp · prtimes.jp