Grilled Portobello Sandwich with Roasted Red Pepper and Mozzarella


I had this once in a restaurant, and have spent a while trying to recreate it. Please enjoy.

Prep Time:
40 mins
Cook Time:
15 mins
Total Time:
55 mins
4 sandwiches


  • 1 red bell pepper

  • salt and black pepper to taste

  • ½ cup olive oil

  • 4 portobello mushroom caps, cleaned

  • 4 slices onion

  • 4 Kaiser rolls, split

  • 4 teaspoons mayonnaise

  • 1 teaspoon roasted garlic, mashed into a paste (Optional)

  • 4 ounces buffalo mozzarella, thinly sliced

  • 4 slices tomato

  • 16 fresh basil leaves, divided


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

  2. Place the red bell pepper onto the preheated grill, and grill until the skin is completely charred on all sides, 10 to 15 minutes. Place the pepper into a paper bag, seal the bag, and let the pepper cool. When cooled, remove the charred skin, slice the pepper into quarters, and remove the seeds. Thinly slice the pepper and set aside.

  3. Mix salt and pepper into the olive oil in a small bowl. Brush the smooth side of the mushrooms with the seasoned oil, and grill, oiled side down, until the mushrooms show grill marks, about 3 minutes. Brush the gill sides of the mushrooms with more seasoned olive oil, flip the mushrooms, and grill until the mushrooms are softened and juicy, about 3 more minutes. Set the mushrooms aside and keep warm.

  4. Lightly grill the slices of onion until softened and lightly browned, about 2 minutes per side. Spread the rolls out onto the grill to toast, about 1 minute. Mix the mayonnaise and roasted garlic in a bowl.

  5. Spread each roll with garlic mayonnaise, and make each sandwich with 1 mushroom cap, 1 ounce sliced mozzarella cheese, 1 slice of tomato, 4 basil leaves, 1 slice of grilled onion, and 1/4 the roasted red pepper slices. Repeat for remaining sandwiches.

Editor's Note

The nutrition data for this recipe includes the full amount of oil used to brush the mushrooms. The actual amount of oil used and consumed will vary.

Nutrition Facts (per serving)

520 Calories
39g Fat
32g Carbs
13g Protein
Nutrition Facts
Servings Per Recipe 4
Calories 520
% Daily Value *
Total Fat 39g 50%
Saturated Fat 9g 43%
Cholesterol 24mg 8%
Sodium 295mg 13%
Total Carbohydrate 32g 12%
Dietary Fiber 4g 14%
Total Sugars 6g
Protein 13g
Vitamin C 43mg 215%
Calcium 222mg 17%
Iron 3mg 14%
Potassium 742mg 16%

* 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.