Vegetarian All-American Portobello Burgers


Portobello mushrooms stand in for meat patties in this recipe for veggie burgers with all the fixings. Mushrooms are a source of glutamate, a naturally occurring compound that gives the fungi their umami flavor. But to really give these "patties" a savory boost, we brush them with steak sauce. Add a simple side salad or some grilled veggies for a satisfying and easy dinner on the grill.

Prep Time:
20 mins
Total Time:
20 mins
4 burgers


  • 4 portobello mushroom caps, gills removed if desired

  • Cooking spray

  • ¼ teaspoon ground pepper

  • 2 tablespoons mayonnaise

  • 1 tablespoon ketchup

  • 1 tablespoon sweet pickle relish

  • 4 teaspoons steak sauce

  • 4 slices American cheese

  • 4 whole-wheat buns, toasted if desired

  • 1 cup shredded iceberg lettuce

  • 4 large tomato slices

  • Thinly sliced red onion & pickles


  1. Preheat grill to medium-high.

  2. Coat mushrooms with cooking spray and sprinkle with pepper. Grill, turning occasionally, until tender, 10 to 12 minutes total.

  3. Meanwhile, mix mayonnaise, ketchup and relish in a small bowl.

  4. Transfer the mushrooms to a plate and pat dry with paper towels. Brush with steak sauce and top the gill side of each mushroom with a slice of cheese. Return the mushrooms to the grill and cook until the cheese is just melted, about 1 minute more. Serve on buns with the sauce, lettuce, tomatoes and onion and pickles, if desired.

Nutrition Facts (per serving)

275 Calories
13g Fat
33g Carbs
10g Protein
Nutrition Facts
Servings Per Recipe 4
Calories 275
% Daily Value *
Total Carbohydrate 33g 12%
Dietary Fiber 5g 19%
Total Sugars 11g
Added Sugars 3g 6%
Protein 10g 20%
Total Fat 13g 17%
Saturated Fat 4g 22%
Cholesterol 24mg 8%
Vitamin A 508IU 10%
Vitamin C 4mg 4%
Folate 53mcg 13%
Sodium 713mg 31%
Calcium 200mg 15%
Iron 2mg 9%
Magnesium 59mg 14%
Potassium 655mg 14%

Nutrition information is calculated by a registered dietitian using an ingredient database but should be considered an estimate.

* Daily Values (DVs) are the recommended amounts of nutrients to consume each day. Percent Daily Value (%DV) found on nutrition labels tells you how much a serving of a particular food or recipe contributes to each of those total recommended amounts. Per the Food and Drug Administration (FDA), the daily value is based on a standard 2,000 calorie diet. Depending on your calorie needs or if you have a health condition, you may need more or less of particular nutrients. (For example, it’s recommended that people following a heart-healthy diet eat less sodium on a daily basis compared to those following a standard diet.)

(-) Information is not currently available for this nutrient. If you are following a special diet for medical reasons, be sure to consult with your primary care provider or a registered dietitian to better understand your personal nutrition needs.

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