Description

This Best Portobello Mushroom Burger recipe offers a delicious, vegetarian alternative to traditional burgers using marinated and grilled portobello mushroom caps topped with melted Brie cheese and a flavorful pesto mayonnaise spread. Perfect for a wholesome and satisfying meal with a gourmet touch.

Ingredients

Scale

Mushroom Marinade

4 portobello mushroom caps
¼ cup olive oil
2 Tbsp. lemon juice
1 garlic clove, minced
¼ tsp. salt
¼ tsp. pepper

Spread and Toppings

3 Tbsp. mayonnaise
1 Tbsp. pesto (store-bought or homemade)
4 oz. Brie cheese
4 hamburger buns

Instructions

Prepare the mushrooms: Trim the stem off each portobello mushroom and gently wipe away any dirt using a wet paper towel, ensuring the mushrooms are clean but not soaked.
Make the marinade: In a bowl, combine olive oil, lemon juice, minced garlic, salt, and pepper. Place the mushrooms gill-side down on a plate and brush them lightly with the olive oil mixture. Flip the mushrooms over and brush the gill side with the remaining marinade. Let them sit and absorb the flavors for ten minutes.
Grill the mushrooms: Preheat your grill to medium heat. Place the mushrooms on the grill gill side up and cook until grill marks form on the underside, about four minutes. Turn the mushrooms 90 degrees to create cross-hatch grill marks and cook for an additional two minutes. Flip the mushrooms and repeat the process. After flipping again, place 1 ounce of Brie cheese on each mushroom cap and allow it to melt while still on the grill. Remove the mushrooms and place them on a plate.
Prepare the spread and assemble: In a small bowl, mix the mayonnaise and pesto until combined. Spread about 1 tablespoon of this mixture on both the top and bottom halves of each hamburger bun. Place the grilled mushroom with melted Brie on the bun and add your favorite burger toppings. Serve immediately.

Notes

For extra flavor, you can add fresh herbs such as thyme or rosemary to the marinade.
If you don’t have a grill, you can use a grill pan or broil the mushrooms in the oven.
To make the burger vegan, substitute mayonnaise with vegan mayo and use vegan cheese in place of Brie.
Letting the mushrooms sit in the marinade ensures they absorb maximum flavor.
Be careful not to overcook the mushrooms as they can become too soft and lose their meaty texture.

Prep Time: 15 minutes
Cook Time: 12 minutes
Category: Main Course
Method: Grilling
Cuisine: American

Keywords: Portobello mushroom burger, grilled portobello burger, vegetarian burger, Brie cheese burger, pesto mayo burger