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Mushroom Swiss Burgers
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5 from 1 vote

Mushroom Swiss Burgers

With a tasty onion-mushroom topping, these Mushroom Swiss Burgers are out of this world! Fire up your BBQ and enjoy them soon!
Prep Time15 minutes
Cook Time35 minutes
Passive time2 hours
Servings: 4 burgers
Author: Francine Lizotte
Course: BBQ - Grilling
Cuisine: International
Keyword 4th of July, Backyard Party, Beef, Canada Day, Comfort Food, Easy Recipe, Finger Food, Sandwiches, Summer Food, Tailgating

Ingredients

  • 1 1/2 lbs. (750 g) lean ground beef
  • 2 tbsp. onion flakes
  • 1/2 tbsp. Montréal Steak Spice see Recipe
  • 1/2 tsp. garlic powder
  • freshly ground black pepper, to taste and divided (I always use mixed peppercorns)
  • 3 tbsp. butter, divided tips & tricks
  • 2 cups white onions, thinly sliced (Lyonnaise cut) tips & tricks
  • ground Himalayan sea salt, to taste
  • 3/4 lb. cremini mushrooms, washed and sliced
  • 1 large clove garlic, pressed
  • 1/2 tbsp. fresh rosemary, finely chopped tips & tricks
  • 1/2 tbsp. Worcestershire sauce
  • 2 1/2 ounces Sherry or Port wine
  • 8 slices Swiss cheese
  • 4 hamburger buns see Recipe
  • 2 tbsp. mayo, or as needed see Recipe

Directions

  • In a large bowl, add ground beef, onion flakes, Montréal Steak Spice, garlic powder and freshly ground black pepper; mix until blended.
  • Form the mixture into 4 equal patties, cover with plastic wrap, and transfer to the fridge for at least 2 hours.
  • A few hours later, take the patties out of the fridge and let them get to room temperature.
  • In a large skillet over medium heat, add 2 tablespoons of butter and when it starts sizzling, add onions; season with salt. Stir to coat slices with butter and cook until soft, about 7 minutes, stirring often.
  • Add the mushrooms and cook for 2 minutes, stirring frequently. Add another tablespoon of butter, season with black pepper and mix until the butter is melted; cook for 3 minutes.
  • Add pressed garlic and sauté for 1 minute. Stir in rosemary before adding Worcestershire sauce and sherry. Cook for 6 to 7 minutes, stirring often.
  • Taste and adjust if necessary, reduce the heat to low and keep warm until needed.
  • Preheat the barbecue to 500ºF.
  • Place the patties on the grates, close the lid and grill them for about 6 to 7 minutes per side
  • Three minutes before the patties are done, place the hamburger buns on the top rack and also put a couple slices of Swiss cheese per patty, close the lid and continue grilling until the buns are nicely toasted and the cheese is melted.
  • To assemble, scoop up a generous amount of the mushroom mixture using a slotted spoon. For the top buns, spread on mayonnaise.