Grilled Portobello with Basil Mayonnaise Sandwich


This grilled portobello sandwich is perfect for summer. You can use just about any type of bread but kaiser rolls or burger buns are the best. I like to serve this with grilled squash and a glass of white wine.

Prep Time:
20 mins
Cook Time:
10 mins
Additional Time:
5 mins
Total Time:
35 mins
6 sandwiches


  • cup balsamic vinegar

  • ¼ cup olive oil

  • 1 tablespoon minced garlic

  • 6 portobello mushroom caps

  • ½ cup mayonnaise

  • 2 tablespoons chopped fresh basil

  • 1 tablespoon Dijon mustard

  • 1 teaspoon lemon juice

  • 6 kaiser rolls, split, toasted

  • 1 tablespoon butter, softened, or as needed

  • 6 leaves lettuce

  • 6 tomato slices


  1. Preheat an outdoor grill for medium heat and lightly oil the grate.

  2. Whisk vinegar, oil, and garlic together in a small bowl.

  3. Arrange mushrooms on a baking sheet with the gills facing up; brush with about 2/3 of the marinade and let sit for 3 to 5 minutes.

  4. Transfer mushrooms to the preheated grill with the gills facing down; grill, basting occasionally with remaining marinade, until tender, about 4 minutes per side.

  5. While the mushrooms are cooking, mix mayonnaise, basil, Dijon, and lemon juice together in a small bowl. Butter toasted rolls, then spread with mayonnaise mixture.

  6. Remove mushrooms from the grill and place on bottom buns. Top with lettuce, tomatoes, and top buns.

Editor's Note:

Nutrition data for this recipe includes the full amount of marinade ingredients. The actual amount consumed will vary.

Nutrition Facts (per serving)

412 Calories
28g Fat
36g Carbs
8g Protein
Nutrition Facts
Servings Per Recipe 6
Calories 412
% Daily Value *
Total Fat 28g 36%
Saturated Fat 5g 25%
Cholesterol 12mg 4%
Sodium 417mg 18%
Total Carbohydrate 36g 13%
Dietary Fiber 4g 15%
Total Sugars 8g
Protein 8g
Vitamin C 19mg 93%
Calcium 73mg 6%
Iron 3mg 15%
Potassium 919mg 20%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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