It's not unusual to find a Mushroom Swiss burger on any bistro menu, but most often a thick slice of pre-cut, processed cheese has been placed on the burger patty. However, for a taste that allows the subtle nature of high quality swiss to complement the beef, slice the swiss into thin opaque pieces and place them atop the mushrooms and not directly on the burger patty.
For an added complementary taste, season the patty with fresh ground black pepper after it comes off the grill.
Enjoy!