Portabella and Onion Topping for Hamburgers

Elevate your burgers with this savory and flavorful Portabella and Onion Topping for Hamburgers. Perfectly caramelized yellow onions pair with tender slices of portabella mushrooms, enhanced by a luscious blend of olive oil, butter, and garlic. A splash of balsamic vinegar brings a tangy depth, while optional fresh thyme adds a fragrant, earthy note. This quick and easy topping comes together in just 25 minutes, making it an ideal way to transform a classic burger into a gourmet delight. Whether you're hosting a barbecue or simply craving a restaurant-quality twist at home, this versatile, umami-packed condiment is sure to impress.

Nutriscore Rating: 73/100

Prep Time:10 mins

Cook Time:15 mins

Total Time:25 mins

Servings: 4

Ingredients

• 2 large caps portabella mushrooms
• 1 large yellow onion
• 2 tablespoons olive oil
• 1 tablespoon butter
• 2 cloves garlic
• 1 tablespoon balsamic vinegar
• 0.5 teaspoon salt
• 0.25 teaspoon black pepper
• 1 teaspoon fresh thyme (optional)

Directions

Step 1

Clean the portabella mushrooms by gently wiping them with a damp paper towel. Slice them into thin, even strips about 1/4 inch thick.

Step 2

Peel and slice the yellow onion into thin rings or half-rings, depending on your preference.

Step 3

Mince the garlic cloves finely and set aside.

Step 4

Heat a large skillet over medium heat and add the olive oil and butter, allowing the butter to melt and combine with the oil.

Step 5

Add the sliced onions to the skillet and cook for 5 minutes, stirring occasionally, until they begin to soften and turn translucent.

Step 6

Add the sliced mushrooms to the skillet and cook for another 5-7 minutes, stirring occasionally, until the mushrooms release their liquid and start to brown.

Step 7

Stir in the minced garlic, salt, and black pepper, and cook for an additional 1-2 minutes until the garlic is fragrant.

Step 8

Pour the balsamic vinegar into the skillet, stirring to coat the mushrooms and onions evenly. Cook for 1-2 minutes until the vinegar slightly reduces and the mixture becomes glossy.

Step 9

If using fresh thyme, sprinkle it over the mixture and stir to combine.

Step 10

Remove the skillet from heat and let the topping cool slightly before serving it warm over your favorite hamburger.

Nutrition Facts

Serving size	(460.1g)

Amount per serving	% Daily Value*
Calories	493.8

Total Fat 40.5g	0%
Saturated Fat 10.9g	0%
Polyunsaturated Fat 3.0g
Cholesterol 32.9mg	0%
Sodium 1286.5mg	0%
Total Carbohydrate 28.4g	0%
Dietary Fiber 6.1g	0%
Total Sugars 13.8g
Protein 7.4g	0%

Vitamin D 19.2IU	0%
Calcium 62.7mg	0%
Iron 1.7mg	0%
Potassium 1171.7mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 71.8%

Protein: 5.8%

Carbs: 22.4%