Prep 15m Cook 15m Additional 2h 10m Ready In 2h 40m
Servings 4 mushroom burgers Calories 375.3

Marinated portabella mushrooms with red pepper mayo. Serve with tomato, onion, and lettuce or your choice of toppings and enjoy.

Recipe Ingredients

  • 4 large portobello mushroom caps
  • ½ cup soy sauce
  • ½ cup balsamic vinegar
  • 4 cloves garlic, chopped, or more to taste
  • 1 large red bell pepper
  • 1 cup reduced-fat mayonnaise
  • 1 tablespoon cayenne pepper, or to taste
  • 4 hamburger buns, split

Cooking Directions

  1. 1 Place mushrooms into a large resealable plastic bag; add soy sauce, balsamic vinegar, and garlic. Seal bag and shake to combine ingredients; marinate mushrooms at room temperature for 2 to 3 hours, turning bag occasionally.
  2. 2 Preheat grill for medium-high heat and lightly oil the grate.
  3. 3 Place red bell pepper onto the grate and grill until the skin is blistered and charred, turning often, about 10 minutes. Transfer pepper to a bowl and cover with plastic wrap; let pepper cool. When pepper is cool enough to handle, remove and discard skin, stem and seed the pepper, and chop.
  4. 4 Mix pepper into mayonnaise in a bowl and stir in cayenne pepper. Chill red pepper mayonnaise until serving time.
  5. 5 Grill marinated mushroom caps until browned and juicy, about 6 minutes per side. Serve mushrooms on buns, topped with red pepper mayonnaise.

Nutrition Facts

  • Calories 375.3
  • Carbohydrate 37.8 g
  • Cholesterol 21 mg
  • Fat 22.5 g
  • Fiber 2.7 g
  • Protein 7.1 g
  • Saturated Fat 3.7 g
  • Sodium 2458.7 mg
  • Sugar 9.4 g

Chef's Notes

The nutrition data for this recipe includes the full amount of the red pepper mayonnaise. The actual amount of the mayonnaise consumed will vary.


  1. Delicious!!
  2. For those who felt the Balsamic was overpowering - I use White Balsamic almost exclusively. A bit lighter and doesn't seem as sweet. Many kinds available - I like the Peach.
  3. I tried this recipe yesterday. I am working on one vegetarian meal a week. It was okay but I wouldn't make it again.
  4. This was good. I like the marinade for the mushrooms but what was so outstanding was the red pepper mayo!! So simple yet so good.
  5. My husband and I really enjoyed these. I liked the fact that it used simple ingredients I had on hand. The red pepper mayo was delicious. I also did not use as much cayenne as it called for. Just about 6 dashes and it was plenty hot. I could only marinate for 1 1/2 hours - Read more ...
  6. Blech! Maybe I did something wrong because the other reviews seem to be great but the mushrooms soaked up so much of the marinade that all we could taste was the vinegar. The mayonnaise was good but I won't be trying these burgers again.
  7. This was excellent!!! However I didnt really measure the ingredients for the marinade and it turned out great. Also make sure to use a good quality balsamic vinegar it does make a huge differernce (no matter the recipe) a good balsalmic is on the thicker side. I also grilled slice beefsteak tomato slices on the - Read more ...
  8. YUM! The marinade gave the mushrooms a wonderful flavor. The mayo was great but a bit spicy for me so I'd reduce the cayenne next time but that's my preference. Instead of roasting a pepper I had a jar of roasted peppers and onions so I went w/ that...perfect! I served these on 'Soft Onion - Read more ...

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