Close-up of a portobello cap with havarti and sauteed mushrooms in a soft burger bun

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French Onion Burgers

A take on the The Well D’Onion · MOOYAH Burgers, Fries & Shakes →A take on the Red Onion Jam Burger · Red Mill Burgers →A take on the Original · Holy Burger →A take on the Oklahoma Smash Burger · Burger & Lobster →Brian Lagerstrom’s take →

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About

These burgers borrow the flavours of French onion soup: deeply cooked onions, a savoury beefy base and cheese. Onion soup mix goes into the beef, and the patties are topped with onions and mushrooms cooked slowly in butter, with two slices of Havarti per burger on the ingredient list.

The onions and mushrooms are the part that takes time. They cook in butter over medium heat, seasoned with salt and pepper, for about twenty minutes, until soft and browned; the recipe does this in a pan set on the grill so everything happens outdoors. Meanwhile two pounds of beef are mixed by hand with the soup mix and shaped into six patties, grilled for about five minutes before flipping and cooking to your liking. The burgers rest for five minutes before going into buns toasted in a dry skillet and spread with a tablespoon of mayonnaise each.

Ingredients

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Burger bun6 hamburger buns, split
Butter4 tablespoons butter
Mushroom8 oz sliced mushrooms
White onion2 onions, thinly sliced
Black peppersalt and freshly ground black pepper to taste
Ground beef2 pounds ground beef
Onion soup mix1 tablespoon Onion Soup Mix (one packet)
Havarti12 slices Havarti Cheese Slices
Mayonnaise6 tablespoons mayonnaise

Recipe

1
Preheat a large skillet over medium heat. Place hamburger bun halves, cut-sides down, in the hot skillet until lightly toasted, 2 to 3 minutes. Remove toasted buns to a plate.
2
Preheat an outdoor grill for medium heat. Heat butter in a large saucepan over medium heat on the grill. Add mushrooms and onions; season with salt and black pepper and cook and stir until mushrooms are lightly browned, about 20 minutes.
3
Meanwhile, mix ground beef and onion soup mix in a bowl using your hands. Form mixture into 6 hamburger patties.
4
Lightly oil grill grates. Grill burgers for about 5 minutes, then flip and grill to your desired doneness. A meat thermometer inserted near the center of patties should read 180 degrees F (82 degrees C).
5
Remove burgers from heat to rest for 5 minutes. Spread each bun with 1 tablespoon mayonnaise, and add burgers; divide mushrooms and onions between burgers to serve.