Mushroom Whopper

マッシュルームワッパー · ¥990 (~$6.27) · 794 kcal

Burger King Japan's autumn fixture, back on September 18, 2026 for a limited run. A flame-grilled 100% beef patty under four kinds of roasted mushroom (two types of button mushroom, eringi and bunashimeji), lettuce, tomato and onion, with a Premium Pepper Mayo sauce built on onion, coarse black pepper and a burnt soy sauce aroma. Set ¥1,290, LL set ¥1,440. 794 kcal. The mushrooms come from China, per the origin table.

Image © Burger King Japan, shown to identify the product. Price checked 2026-10-04; prices are the tax-inclusive yen figures Burger King Japan's own web menu (burgerking.co.jp) showed on the check date, which its legal notice page (特定商取引法に基づく表記) and campaign notes state are tax-inclusive; the single-item price is given, with set prices (fries S and drink M) in the blurb; the site prints a tilde after a price when larger variants exist; some items are not sold at a few named stores and limited items carry no end date.