Grilled Portobello and Avocado

Featured in: Daily Meal Planning

Try these grilled portobello mushroom burgers, a delicious vegetarian option for your next cookout. Marinated portobello caps are grilled to perfection, then topped with creamy avocado, fresh tomato, crisp lettuce, and zesty red onion. Served on toasted buns with a spread of mayo and Dijon mustard, this satisfying burger is easy to prepare and can be customized with additional toppings. Great for summer gatherings or a quick weeknight meal!

Updated on Mon, 11 May 2026 17:08:01 GMT
Juicy grilled portobello mushroom burgers loaded with fresh avocado and toppings. Save
Juicy grilled portobello mushroom burgers loaded with fresh avocado and toppings. | akalkitchenette.com

There's something about the smell of marinated mushrooms sizzling on the grill that just lights up my evenings. The first time I discovered grilled portobello mushroom burgers, it was during a summer cookout with friends, when someone casually suggested we explore vegetarian options. I remember my surprise at how satisfying a mushroom could be as a burger substitute, packed with flavor and juiciness. Perhaps it was the laughter and chatter filling the air or the gathering around the grill, but that evening remains etched in my memory. These burgers quickly became a staple for our barbecues, proving that veggie meals can be just as thrilling as meaty ones.

One summer evening, I decided to surprise my family with these mushroom burgers, and I’ll never forget the joy on their faces when they took their first bite. Somehow, I ended up accidentally adding a bit too much garlic, which led to a hilarious garlic breath battle later, but we laughed it off as everyone devoured their burgers. I served them alongside crispy sweet potato fries, and while there were jokes about the garlic, the focus remained on how fantastic these burgers tasted. It became a fun ritual, where each summer we’d try to outdo each other with new toppings and sides. Every bite reminded us that simple ingredients can lead to spectacular meals.

Ingredients

  • Portobello mushrooms: These are the stars of the dish and are incredibly meaty and satisfying. Be sure to choose large caps for the best burger experience.
  • Olive oil: It helps in achieving that perfect grill sear and keeps the mushrooms juicy.
  • Balsamic vinegar: Adds a lovely tanginess that enhances the natural umami flavor of the mushrooms.
  • Fresh vegetables: Crisp lettuce, ripe tomatoes, and creamy avocado bring freshness and balance to the hearty burger.
  • Burger buns: Choose your favorite type; gluten-free buns are an excellent option for those with dietary restrictions.

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Instructions

Prepare the marinade:
In a small bowl, whisk together the olive oil, balsamic vinegar, soy sauce, minced garlic, oregano, smoked paprika, salt, and pepper until blended.
Marinate the mushrooms:
Brush the marinade over both sides of the portobello caps, letting them soak in the flavors for about 10-15 minutes while you preheat the grill.
Grill the mushrooms:
Place the mushrooms on the grill cap side down for 4-5 minutes per side, until they become tender and slightly charred.
Toast the buns:
If desired, toast the burger buns lightly on the grill, adding a nice crunch.
Assemble the burgers:
Spread the mayonnaise and Dijon mustard on the bottom half of each bun and layer with lettuce, grilled portobello, tomato, avocado slices, and red onion. Top with the remaining bun half.
Serve and enjoy:
Enjoy your mouthwatering portobello mushroom burgers immediately, paired with your favorite sides!
Hearty grilled portobello burgers topped with creamy avocado, perfect for cookouts. Save
Hearty grilled portobello burgers topped with creamy avocado, perfect for cookouts. | akalkitchenette.com

I recall a day when I made these burgers for a potluck, and they quickly became the highlight of the table. As everyone gathered around, chatting and swapping stories, I found myself pleasantly surprised by the compliments rolling in. It was heartwarming to see people dive back for seconds, proving once again that these burgers transcend dietary preferences and create a delightfully shared experience.

Beyond the Grill

Once you get the hang of grilling portobello mushrooms, there are endless variations to explore. Try adding a slice of vegan cheese during the last minute of grilling for a melty twist. Or switch out the toppings based on what's fresh at the market; roasted red peppers or jalapeños could really elevate these burgers!

Exploring Flavor Combinations

Experimenting with diverse toppings can turn these burgers into a new creation every time. For a Mediterranean touch, consider adding hummus instead of mayonnaise, or even a tangy tzatziki sauce. The beauty of these burgers lies in their versatility, so don’t hesitate to let your creativity shine!

Last-Minute Tips for Perfection

Don’t forget to check the grill temperature to ensure even cooking throughout the mushrooms. For an extra crunch, consider adding pickled veggies for an unexpected kick.

  • Give yourself enough time to marinate the mushrooms.
  • Use fresh, high-quality ingredients for the best flavors.
  • Trust your instincts and taste as you go!
Delicious grilled portobello mushroom burgers served on toasted buns with avocado. Save
Delicious grilled portobello mushroom burgers served on toasted buns with avocado. | akalkitchenette.com

These grilled portobello mushroom burgers are not just a meal; they’re a heartfelt gathering experience waiting to unfold. Here’s to many delicious meals shared with loved ones!

Recipe Questions

How long do I marinate the mushrooms?

You should marinate the portobello mushrooms for 10-15 minutes to absorb the flavors of the marinade.

Can I make this dish gluten-free?

Yes, simply use gluten-free burger buns and tamari in place of soy sauce for a gluten-free version.

What can I substitute for mayonnaise?

Hummus or avocado spread can be great alternatives to mayonnaise if you prefer a lighter or vegan option.

What side dishes pair well with these burgers?

Sweet potato fries and fresh green salads are excellent accompaniments to these hearty mushroom burgers.

How can I add more flavor?

For extra flavor, you can add a slice of cheese or toppings like pickled jalapeños for a spicy kick during grilling.

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Grilled Portobello and Avocado

Enjoy grilled portobello mushrooms topped with avocado and fresh toppings.

Prep Time
15 min
Time to Cook
10 min
Total Duration
25 min
Recipe by Natalie Harper


Skill Level Easy

Cuisine American

Makes 4 Portions

Diet Preferences Meatless, No Dairy

What You Need

Mushrooms & Marinade

01 4 large portobello mushroom caps, stems removed and gills scraped
02 3 tablespoons olive oil
03 2 tablespoons balsamic vinegar
04 2 teaspoons soy sauce (or tamari for gluten-free)
05 2 cloves garlic, minced
06 1 teaspoon dried oregano
07 ½ teaspoon smoked paprika
08 Salt and black pepper, to taste

Burger Assembly

01 4 burger buns (use gluten-free if needed)
02 1 ripe avocado, sliced
03 4 slices tomato
04 4 leaves lettuce (romaine or iceberg)
05 ½ red onion, thinly sliced
06 4 tablespoons mayonnaise or vegan mayo
07 2 teaspoons Dijon mustard

How To Make It

Step 01

Prepare the Marinade: In a small bowl, whisk together olive oil, balsamic vinegar, soy sauce, minced garlic, oregano, smoked paprika, salt, and pepper.

Step 02

Marinate the Mushrooms: Brush the marinade over both sides of the portobello caps. Let them marinate for 10-15 minutes while you prepare the toppings and preheat the grill to medium-high heat.

Step 03

Grill the Mushrooms: Grill the mushrooms, cap side down first, for 4-5 minutes per side, until tender and slightly charred.

Step 04

Toast the Buns: Toast the burger buns lightly on the grill, if desired.

Step 05

Assemble the Burgers: Spread mayonnaise and Dijon mustard on the bottom half of each bun. Layer with lettuce, grilled portobello, tomato slice, avocado slices, and red onion. Top with the remaining bun half.

Step 06

Serve: Serve immediately with your favorite side dishes.

What You’ll Need

  • Grill or grill pan
  • Mixing bowl
  • Basting brush
  • Knife and cutting board

Allergy Notes

Look over every ingredient for allergens and check with your doctor if unsure.
  • Contains: Soy (in soy sauce), Gluten (in buns unless using gluten-free options), Egg (in mayonnaise unless using vegan mayo)
  • Double-check product labels to confirm allergens and use substitutions as needed.

Nutrition Info (One Serving)

Nutrition details shown here are for your general knowledge and don't substitute for a professional's advice.
  • Calories: 320
  • Fats: 15 g
  • Carbohydrates: 38 g
  • Proteins: 7 g

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