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    Home » Recipes » Burgers

    Caramelized Onion Burgers with Balsamic Mayo

    Published: May 17, 2023 by Fox Valley Foodie · This post may contain affiliate links

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    Caramelized Onion Burgers with Balsamic Mayo recipe #burger #burgers #lunch #beef

    This caramelized onion burger recipe takes homemade burgers to the next level with just a few simple ingredients! A flavorful bun is loaded with a juicy patty, melted cheese, sticky caramelized onions, and a delectably tangy sauce. This delicious burger is absolute perfection!

    Caramelized Onion Burger.

    I love this great recipe because it combines three of my favorite things I have written about extensively. The first, of course, is my wildly popular tutorial for crafting obscenely tender hamburger patties. Seriously, it will turn you into an instant burger snob. Combine a perfect patty with sweet and sticky caramelized onions, and a tangy burger sauce, and you have perfection on a bun!

    Ingredients & Substitutions

    • Ground beef - 80/20 ground beef or ground chuck is recommended. Don't use very lean ground beef or the patty won't be juicy.
    • Olive oil - Butter is a great substitute.
    • Provolone Cheese - Blue cheese, Swiss cheese, or Gruyere cheese would each be fantastic substitutes.
    • Caramelized onions - You will need two large yellow onions, or sweet onions, along with 1 ½ tablespoons of butter.
    • Hamburger buns - Onion rolls, brioche buns, or pretzel buns are my recommended choices.
    • Mayonnaise
    • Balsamic vinegar

    How to make Caramelized Onions

    To make deliciously sweet caramelized onions simply add two sliced onions to a saute pan set over medium heat along with a couple tablespoons of butter and slowly saute for about 30 minutes (you can't rush the caramelization process), or until the onions are brown and sticky. As they cook sugar will be coaxed out of the onion, making them incredibly sweet and flavorful.

    When the onions have turned a deep golden brown, deglaze the pan with water, wine, or balsamic vinegar to remove all of the burnt-on fond stuck to the bottom of the hot skillet. This stuff is PURE FLAVOR! When it loosens from the bottom of the pan, it will soak in with the onions. For an even more detailed explanation of this process, please check out my How to Make Caramelized Onions tutorial!

    How to make Balsamic Mayo

    I top my Caramelized Onion Burger with a tangy balsamic mayo burger sauce. It is a perfect fit for this burger recipe because the acidity of balsamic vinegar and the sweetness of caramelized onions are a classic combination.

    Balsamic mayo can be made by mixing ¾ teaspoon of balsamic vinegar and ¼ cup of mayo together in a small bowl. Adding fresh ground pepper to taste is a great way to deepen the flavor further. This condiment is even better when made in advance because the flavors will meld together.

    Gourmet Burgers with Burger Sauce.

    How to make caramelized onion burgers

    A good burger starts with a great patty. Don't overwork your meat when forming the hamburger patties. The more it is worked, the tougher it will be. Form the ground beef into rounds, then press firmly with the bottom of a plate or burger press to flatten them.

    Tip: Using parchment paper will prevent the raw patties from sticking to the cutting board, plate, or your hands.

    Adding a little oil to a hot cast iron skillet helps your burger form a flavorful crust while cooking. Set your frying pan over medium-high heat and cook the hamburgers until the tops begin to darken in color, then flip and let cook for a couple minutes further.

    Tip: NEVER press a burger while it is cooking, or you will expel the juices and have a very dry patty.

    When the burger is flipped it is a great time to add the Provolone cheese so it melts as the patty finishes cooking. Add the cooked onions after the burger is on the bun.

    Every time you make a burger, toast the inside of the buns. This improves the overall texture and will help it taste more like a restaurant-caliber burger. Spreading some of the burger sauce on the bottom bun also prevents it from becoming soggy because the juice from the patty can't penetrate oil-based mayo.

    Once assembled, let these juicy burgers rest for a couple of minutes, then serve with homemade steak fries, truffle fries, or oven-baked sweet potato fries.

    Serving Caramelized Onion Burgers.
    Caramelized Onion Burgers Recipe

    Caramelized Onion Burgers

    These caramelized onion burgers load a juicy beef patty, sticky caramelized onions, and a tangy balsamic burger sauce in each savory bite!
    5 from 3 votes
    Print Pin Rate Save Saved
    Course: Sandwich
    Cuisine: American
    Prep Time: 3 minutes minutes
    Cook Time: 8 minutes minutes
    resting time: 5 minutes minutes
    Total Time: 11 minutes minutes
    Servings: 3
    Calories: 696kcal
    Author: Fox Valley Foodie

    Ingredients

    • 1 pound ground beef (ground chuck is perfect)
    • 2 tablespoon olive oil
    • salt and black pepper to taste
    • 3 slices provolone Cheese
    • 6 tablespoons caramelized onions
    • 3 hamburger buns

    Balsamic Mayo

    • ¼ cup mayo
    • ¾ teaspoon balsamic vinegar
    • fresh ground black pepper to taste

    Instructions

    Balsamic Mayo

    • Combine all ingredients and set aside.

    Caramelized Onion Burgers

    • Divide the ground beef into 3 equal sections and gently form them into rounds. Press each round firmly with a flat object, like the bottom of a plate, to form into patties. Season generously with salt and black pepper.
    • Set a large skillet over medium-high and add cooking oil. Once the oil is shimmering add burger patties, cooking in batches if needed. Cook until a brown crust forms on the bottom and the top is beginning to turn a deep red. Flip patties, top with cheese, and cook for a few minutes longer, until the cheese melts.
    • Lightly toast the buns, then spread Balsamic Mayo on the inside of the hamburger buns. Add burger patty to the buns and top with ~2 tablespoons caramelized onions per burger, or to taste.
    • Let the burgers rest briefly to allow juices to redistribute, then serve and enjoy!

    Notes

    When making caramelized onions for this recipe, I recommend using 2 large yellow onions and 1 ½ tablespoons of butter.
    You can also make this as fast-food-style smash burgers by using thin hamburger patties.

    Nutritional Information

    Calories: 696kcal | Carbohydrates: 24g | Protein: 37g | Fat: 48g | Saturated Fat: 17g | Cholesterol: 126mg | Sodium: 562mg | Potassium: 545mg | Fiber: 1g | Sugar: 4g | Vitamin A: 245IU | Vitamin C: 2.8mg | Calcium: 320mg | Iron: 4.6mg
    Tried this Recipe? Pin it Today!Mention @FoxValleyFoodie or tag #foxvalleyfoodie!

    This recipe was originally published here on June 6, 2018.

    More Gourmet Burger Recipes

    • Truffle burger recipe.
      Truffle Burger
    • Pub burgers recipe.
      Pub Burgers
    • Wisconsin butter burger recipe.
      Wisconsin Butter Burgers
    • Best venison burger recipe.
      Best Venison Burger

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    Reader Interactions

    Comments

    1. tony

      April 24, 2020 at 5:37 pm

      5 stars
      Loved this - outstanding & thankyou.You mention deglazing the pan when the onions are caramelised...is it ok to do that after everything cooked in the pan?

      Reply
      • Fox Valley Foodie

        April 28, 2020 at 8:52 am

        You want to deglaze the pan after the onions are cooked so they can incorporate the fond into them. Don't wait for everything to be cooked.

        Reply
    2. Linda

      December 07, 2019 at 8:45 am

      I Love all your recipes, can't wait to try them.

      Reply
    3. Doug A

      June 14, 2018 at 1:21 pm

      5 stars
      Oh my god, yes!

      Reply
    5 from 3 votes (1 rating without comment)

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