This is a Japanese-style hamburger stuffed with enoki mushrooms and covered with a shimeji mushroom sauce. It has a mild flavor with lots of mushrooms.
I added lots of mushrooms to this basic hamburger recipe since it's fall, the season for mushrooms. It was intended for an adult palate, but my kids love this dish.
When shaping the patties, don't make them too thin or press down with a spatula when cooking. It'll result in fluffy patties.
Enjoy Japanese food around the world.