Burger King Japan Launches Mushroom Ugly Burger® with 4-Cheese Craft Buns from May 8, 2026
Key Takeaways: The Mushroom Ugly Burger® runs at Burger King Japan nationwide from May 8 to May 17, 2026, at 1,090 yen single or 1,390 yen for a set. It stacks four mushroom varieties and sour cream onion sauce on 4-Cheese Craft Buns, which take so much hand work that only a third of normal bun volume can be baked. An app coupon takes the set to 1,290 yen. Burger King® Hit Mushroom Series Returns with New Premium Edition BK Japan Co., Ltd. will launch the Mushroom Ugly Burger® as a limited-time offering at Burger King® locations nationwide from Friday, May 8 through Sunday, May 17, 2026. This newest entry in the wildly popular Mushroom series combines four varieties of mushrooms with the signature 4-Cheese Craft Buns used in the beloved Ugly Burger lineup, creating a hearty and authentic burger experience. The Painstakingly Crafted 4-Cheese Craft Buns The 4-Cheese Craft […]
Burger King Japan Launches Mushroom Ugly Burger® with 4-Cheese Craft Buns from May 8, 2026 Read More




