Recipes Main Dishes Sandwich Recipes Portobello Sandwiches 4.6 (314) 218 Reviews 11 Photos Quick, juicy burgers. My friends and I eat them at least once a week! Recipe by Nicholle Updated on July 14, 2022 Save Saved! View All Saved Items Rate Print Share Share Tweet Pin Email Add Photo 11 11 11 11 Prep Time: 8 mins Cook Time: 9 mins Additional Time: 3 mins Total Time: 20 mins Servings: 4 Yield: 4 burgers Jump to Nutrition Facts Ingredients 2 cloves garlic, minced 6 tablespoons olive oil ½ teaspoon dried thyme 2 tablespoons balsamic vinegar salt and pepper to taste 4 large portobello mushroom caps 4 hamburger buns 1 tablespoon capers ¼ cup mayonnaise 1 tablespoon capers, drained 1 large tomato, sliced 4 leaves lettuce Directions Turn on broiler, and adjust rack so it is as close to heat source as possible. In a medium-size mixing bowl, mix together garlic, olive oil, thyme, vinegar, salt and pepper. Put the mushroom caps, bottom side up, in a shallow baking pan. Brush the caps with 1/2 the dressing. Put the caps under the broiler, and cook for 5 minutes. Turn the caps, and brush with the remaining dressing. Broil 4 minutes. Toast the buns lightly . In a small bowl, mix capers and mayonnaise. Spread mayonnaise mixture on the buns, top with mushroom caps, tomato and lettuce. I Made It Print Nutrition Facts (per serving) 445 Calories 33g Fat 31g Carbs 8g Protein Show Full Nutrition Label Hide Full Nutrition Label Nutrition Facts Servings Per Recipe 4 Calories 445 % Daily Value * Total Fat 33g 43% Saturated Fat 5g 25% Cholesterol 5mg 2% Sodium 426mg 19% Total Carbohydrate 31g 11% Dietary Fiber 4g 13% Total Sugars 7g Protein 8g Vitamin C 8mg 42% Calcium 88mg 7% Iron 3mg 16% Potassium 727mg 15% * 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. Powered by the ESHA Research Database © 2018, ESHA Research, Inc. All Rights Reserved