Combine meat with chopped onions and mushrooms, add Worcestershire sauce and salt and pepper. Form 4 large patties. Push in the center of the patties to keep them flat while cooking. Drizzle pan with a touch of extra-virgin olive oil.
Lightly toast your rolls, then add burgers to the pan. Pan-fry burgers ~4 minutes on each side for medium-well doneness.
Combine balsamic, mayonnaise and coarse cracked black pepper in a small dish.
Just before you are ready to take them out of the pan, place Swiss cheese slice on top of patties. Cover with lid and turn off heat under pan. Allow the cheese to begin to melt down, about 2 minutes.
To assemble, slather bottoms of buns with balsamic black pepper mayonnaise, then place burgers on top.
Enjoy!
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Serves: 4 