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These gourmet burgers are beyond your average backyard BBQ fare. Soy-Glazed Mushroom Swiss Burgers with Caramelized Onions & Rosemary Aioli are a flavor wallop to the mouth in the best possible way!

These gourmet burgers are beyond your average backyard BBQ fare.  Soy-Glazed Mushroom Swiss Burgers with Caramelized Onions & Rosemary Aioli are a flavor wallop to the mouth in the best possible way!

Soy-Glazed Mushroom Swiss Burgers with Caramelized Onions & Rosemary Aioli

When it comes to a really good burger – and I mean a REALLY good burger – it’s all about proper seasoning, cooking, and then topping it with amazing ingredients that go beyond your average leaf lettuce and slice of tomato. I love those classic burgers too, but today we’re talking handcrafted artisan hamburgers, the kind that are restaurant-worthy and packed with incredible flavors.

Those words – handcrafted and artisan – get bandied about these days but I mean them in the truest senses of the words. We’re shaping our patties by hand and being intentional with the combination of soy glaze and mushrooms to add major levels of umami to these savory, juicy burgers, topping them with melted swiss cheese, and then adding caramelized onions which add a natural element of sweetness that compliments that other flavors so well. Then sandwiching everything onto high-quality, toasted challah buns rather than the cheap store-bought variety. And instead of just plain ol’ mayo for a sauce, go ahead and make a super easy and wonderful rosemary aioli that literally takes all of about 4 minutes to throw together. You will want to make your aioli and caramelized onions first so they are ready to go once the burgers are done, but both of those steps can be done well in advance to minimize the amount of actual cooking time the day you want to make these mushroom swiss burgers.

An image of a mushroom swiss burger on a homemade challah bun with caramelized onions and a rosemary garlic aioli.

How to Make Soy-Glazed Mushroom Swiss Burgers

So I have this thing about burgers where I love to top them with ALL THE THINGS. Who’s with me?

However, when you add all the things, burgers can quickly become unmanageable. So what’s a girl to do when she wants mushrooms AND caramelized onions on a burger and both have a tendency to increase the slidey-ness of the bun?

An image of the ingredients for making soy-glazed swiss mushroom burgers with caramelized onions, rosemary aioli and challah hamburger buns.

The answer came to me when I was thinking about blending mushrooms with ground meat for the meaty mushroom chili that I shared a while back. Why not just chop up the mushrooms and mix it in with the lean ground beef before shaping the hamburger patties so I could get all the mushroom flavor I love while simultaneously making a more manageable burger?! It’s just another reason why I’m a blenditarian! If you want to take the monthly Blenditarian Challenge you might even win $250!

An image of a bowl of lean ground beef and chopped mushrooms being blended together.

And it totally works great! Plus, it has the added benefit of actually making a burger that is actually a bit better for your health. Mushrooms are naturally fat-free, cholesterol free, low in calories, and provide important nutrients like vitamin D, B vitamins, antioxidants and potassium, which helps lighten up the burgers a bit without sacrificing any of the deliciousness.

Plus, when mushrooms are chopped to a similar texture as the ground beef, they help stretch your meat farther. You actually get more burgers (or bigger burgers if that’s the way you decide to go) using less meat than you might normally use and they are every bit as satisfying because chopped mushrooms mimic ground meat so well! Make the pledge to be a blenditarian and share what drives you to do better!

You can grill these on your backyard grill just like you would a normal burger, or make them indoors in a cast-iron pan, which is the choice I made this time around. The burgers only take a few minutes on each side to cook through, and they get brushed with a soy sauce glaze that adds a really wonderful to the burgers that make them stand-out from other burgers you might have had. Then just top each burger with a slice of swiss cheese and cover the pan with foil until the cheese is completely melted and the burgers are cooked to your liking.

A collage of hamburger patties made with lean ground beef and chopped mushrooms cooking in a cast iron pan then being topped with melted swiss cheese.

From there, it’s basic burger assembly, provided you have your caramelized onions and rosemary aioli ready to go. Butter and toast those buns on a griddle or on the grills, then just stack the bottom bun, burger, caramlized onions, and top bun slathered with a generous amount of aioli.

These gourmet burgers are beyond your average backyard BBQ fare.  Soy-Glazed Mushroom Swiss Burgers with Caramelized Onions & Rosemary Aioli are a flavor wallop to the mouth in the best possible way!

How to Make Caramelized Onions

Caramelized onions are so great to add to everything from burgers to soup to dips. And they are so easy, albeit a little time-consuming, to make! The only tricks are to use lower heat and give them time so they cook slowly and evenly and don’t burn. Here is a fantastic tutorial about how to caramelize onions if you need a step-by-step guide with videos for each step, but it’s pretty simple to make caramelized onions as described below:

  1. Chop two large onions into strings about 1/4″ wide. You don’t want them so thin that they melt into nothingness.
  2. Melt two tablespoons of butter in a large skillet or pan over medium heat.
  3. Add the onions and toss them around with tongs or a wooden spoon just until they start to soften and turn translucent. This only takes a few minutes and your pan might seem really full, but the onions will cook down quickly.
  4. Reduce the heat to medium-low, season with a little salt, and continue to cook the onions, stirring every few minutes to make sure they don’t stick to the pan or cook unevenly, for about 40-45 minutes. You may need to add a little water or chicken broth here and there to replace some of the water that evaporates out of the onions. You can also reduce the heat to low if you start seeing bare spots in the pan where the onions start sticking and the onions seem to be cooking too quickly around the edges.
  5. The onions will go from a pale yellow, to a golden yellow, to a deep, golden brown, which is when they are done and perfect for topping burgers (or grilled chicken or pork chops or whatever).

An image of step-by-step pictures for how to make caramelized onions.

Looking for More Amazing Burger Recipes?

Soy-Glazed Mushroom Swiss Burgers with Caramelized Onions & Rosemary Aioli
Yield: 4 people

Soy-Glazed Mushroom Swiss Burgers with Caramelized Onions & Rosemary Aioli

These gourmet burgers are beyond your average backyard BBQ fare.  Soy-Glazed Mushroom Swiss Burgers with Caramelized Onions & Rosemary Aioli are a flavor wallop to the mouth in the best possible way!

Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes

Ingredients

Burgers

  • 1 pound lean ground beef
  • 12 ounces white mushrooms, chopped fine
  • Salt & pepper, to taste
  • 1 tablespoon olive oil

Soy Glaze

  • 1/3 cup brown sugar
  • 1/4 cup low-sodium soy sauce
  • 3 tablespoons granulated sugar
  • 2 tablespoons water
  • 1 tablespoon white vinegar
  • 1 tablespoon rice vinegar
  • 1/4 teaspoon ground ginger

Caramelized Onions

  • 2 large onions
  • 2 tablespoons butter
  • Pinch of salt

Assembly

  • 4 challah buns
  • 4 slices Swiss cheese
  • 1/2 cup Rosemary aioli

Instructions

Soy Glaze

  1. Stir all of the glaze ingredients together in a small saucepan over medium-high heat.  Once the liquid comes to a boil, reduce the heat to medium-low, and cook until reduced in volume by half, about 30 minutes.  Let the glaze cool 30 minutes before using.  It will thicken as it cools.

Caramelized Onions

  1. Chop the onions into 1/4" wide strips.  Melt two tablespoons of butter in a large skillet or pan over medium heat, then add the onions and stir just until they start to soften and turn translucent. 
  2. Reduce the heat to medium-low, season with a little salt, and continue to cook the onions, stirring every few minutes to make sure they don't stick to the pan or cook unevenly, for about 40-45 minutes. You may need to add a little water or chicken broth here and there to replace some of the water that evaporates out of the onions.  The onions will go from a pale yellow, to a golden yellow, to a deep, golden brown when done.

Burgers

  1. In a large bowl, combine the ground beef with the finely chopped mushrooms, by hand, until incorporated.  Shape into 4 large patties and season both sides generously with salt and pepper.
  2. Heat 1 tablespoon of olive oil in a large cast iron pan over medium-high heat until hot.   Add the patties and cook without moving for 3 to 4 minutes until nicelyl browned, before flipping to the other side.  Immediately brush the burgers with the soy glaze and top each burger with a slice of swiss cheese.  Loosely cover the pan with aluminum foil to help the cheese melt, and cook another 3 to 4 minutes on the second side until the cheese has melted and the burgers are done.  Transfer to a plate.
  3. Butter both split sides of the hamburger buns and toast on a griddle, then assemble the burgers by placing a cooked patty on each toasted bun and topping with the caramelized onions.  Spread the toasted side of each top bun with a generous amount of aioli and place on top, then serve.

Notes

Soy Glaze recipe adapted from AllRecipes.

Nutrition Information:

Yield:

4

Amount Per Serving: Calories: 725 Saturated Fat: 13g Cholesterol: 120mg Sodium: 1199mg Carbohydrates: 65g Fiber: 3g Sugar: 35g Protein: 40g

I was selected for this opportunity as a member of CLEVER and the content and opinions expressed here are all my own.