Miso Butter Salmon or Chan Chan Yaki (ちゃんちゃん焼き), is a Japanese dish that originated in the Ishikari region of Hokkaido. It's an area known for its salmon, and this dish was originally prepared in steel drums to feed large numbers of fisherfolk. Traditionally, it's made by stir-frying vegetables such as cabbage, onions, and carrots and then placing a salmon filet on top. This is then steamed with a sauce made from miso, sugar, and sake before being finished off with butter.