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close up prepared burger on plate
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5 from 5 votes

French Onion Burger

A beefy, satisfying burger smothered in caramelized jammy onions as a nod to French Onion soup.
Prep Time20 mins
Cook Time20 mins
Total Time40 mins
Course: dinner, lunch
Cuisine: American
Keyword: beef, burger, sandwich, summer
Servings: 6
Author: foodyschmoody


For Onions

  • 1 T olive oil
  • 1 T butter
  • 3 medium sized sweet onions sliced thinly
  • 1 teaspoon worcestershire sauce
  • 1 teaspoon salt
  • ½ teaspoon black pepper
  • ¼ C beef broth

For Burgers

  • 2 lb ground beef 85%
  • 1 T Worcestershire sauce
  • 2 T beef broth
  • ½ teaspoon black pepper
  • 6 oz fontina cheese sliced
  • 6 hearty hamburger buns


  • Heat oil and butter in a saute pan over medium/high heat. Add onions once butter is melted. After 5 minutes, reduce heat to medium and give onions a stir. Continue to cook over medium heat, if onions seem to be leaning towards burning, turn down to medium/low. Stir occasionally but not too often. After about 1 minutes, season with salt, pepper and worcestershire sauce. Cook another 5-10 minutes until onions are soft and caramelized. Deglaze the pan with the beef broth and continue to cook until liquid is just about absorbed; approximately 5 more minutes. Set aside.
  • While onions are caramelizing, in a large bowl combine beef, worcestershire sauce, beef broth and black pepper. Shape into patties. You should get about 6 BIG patties. Be sure to press your thumb in the center of each patty, creating a divot, which will result in a more evenly rounded patty after cooking.
  • Heat grill to medium/high heat. Place burgers on preheated grill. Cook about 5-6 minutes until burger easily releases from grates. Flip over, reduce heat to medium to medium low, depending on how hot your grill cooks. Close cover and cook another 8-12 minutes or until desired doneness. Place cheese on each burger, close cover just until cheese melts, about 2 minutes.
  • Place buns, cut side down on grill to toast - about 3 minutes.
  • Create burger by placing cheeseburger on bun an top with caramelized onions.