Grilled Portobello and Avocado

Featured in: Savory Quick Bites

Grilled Portobello Mushroom Burgers are a delightful vegetarian option featuring marinated mushrooms as hearty patties. The mushrooms are brushed with a flavorful marinade of olive oil, balsamic vinegar, and spices before being grilled to perfection. They are served on buns with creamy avocado, fresh tomatoes, crisp lettuce, and tangy red onion. This easy-to-make dish is ideal for summer cookouts, offering a satisfying and nutritious meal option for everyone.

Updated on Tue, 21 Jul 2026 01:02:28 GMT
Juicy grilled portobello mushroom burgers piled high with fresh avocado. Save
Juicy grilled portobello mushroom burgers piled high with fresh avocado. | collationspot.com

There's something utterly magical about the aroma of portobello mushrooms sizzling on the grill, mingling with the fresh scent of summer in the air. One afternoon, while trying to impress some friends during a backyard cookout, I stumbled upon this recipe for grilled portobello burgers. The combination of the meaty mushrooms with creamy avocado turned out to be a game-changer. It's incredible how something so simple can feel so gourmet when prepared with care. As we gathered around the table, all of us chuckling and chatting, these burgers transformed our meal into a delightful feast.

This recipe really became a favorite after a warm summer evening spent with friends. We had all gathered for a potluck, and I offered to grill these burgers. The laughter and lively conversations mixed with the smoky scent of mushrooms sizzling on the grill—there’s just something about good food that brings people together.

Ingredients

  • Portobello Mushrooms: These are the star of the dish. Make sure to pick plump caps that are firm to the touch, as they hold up beautifully on the grill.
  • Olive Oil: A drizzle ensures your mushrooms get that perfect golden char while preventing sticking.
  • Balsamic Vinegar: This adds a tangy depth that enhances the earthiness of the mushrooms.
  • Dijon Mustard: It gives a bit of zip to your burger without overwhelming the flavors.
  • Avocado: Don't skimp on the avocado; its creaminess balances out the smoky flavors excellently.

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Instructions

Make the Marinade:
In a small bowl, whisk together the olive oil, balsamic vinegar, soy sauce, minced garlic, oregano, smoked paprika, salt, and pepper until well combined.
Marinate the Mushrooms:
Brush the marinade generously over both sides of the portobello caps, then let them sit for 10-15 minutes while you prepare your toppings.
Grill the Mushrooms:
Preheat your grill to medium-high heat; place the mushrooms cap side down and grill for 4-5 minutes on each side until they're tender and slightly charred.
Toast the Buns:
If you desire a crunchy texture, toast the burger buns lightly on the grill.
Assemble the Burgers:
Spread mayonnaise and Dijon mustard on the bottom half of each bun, and layer with lettuce, grilled mushrooms, a slice of tomato, avocado, and red onion.
Hearty grilled portobello burgers showcasing creamy avocado and crisp lettuce. Save
Hearty grilled portobello burgers showcasing creamy avocado and crisp lettuce. | collationspot.com

Every time I make these portobello burgers for friends, they're always surprised by how flavorful and filling they are, often forgetting they’re eating a veggie dish! There’s something special about sharing these moments—watching friends savor each bite while enjoying their company.

Tips for Grilling Success

Choosing the right mushrooms is key; fresh and large mushrooms not only look appealing but also provide the best texture for grilling. Always marinate ahead of time for maximum flavor absorption.

Serving Suggestions

These burgers pair perfectly with sweet potato fries or a crisp garden salad. For an unexpected twist, consider adding grilled vegetables for extra color and taste.

Final Thoughts

Grilling these portobello burgers is more than just cooking; it’s about creating happy memories with friends. Enjoy every bite and every laugh around the table!

  • Make sure to keep an eye on the grill to prevent burning.
  • Consider adding different toppings for a unique twist.
  • Don’t forget the napkins; things can get deliciously messy!
Delicious grilled portobello mushroom burger, perfect for a summer cookout. Save
Delicious grilled portobello mushroom burger, perfect for a summer cookout. | collationspot.com

Take a moment to celebrate the joy of cooking and connecting. Portobello burgers are a testament to how simple ingredients can create unforgettable experiences.

Recipe Help

What ingredients are needed for the marinade?

The marinade includes olive oil, balsamic vinegar, soy sauce, garlic, oregano, smoked paprika, salt, and black pepper.

How long should I marinate the mushrooms?

Marinate the portobello caps for about 10-15 minutes for optimal flavor.

Can I use gluten-free buns?

Yes, you can substitute regular burger buns with gluten-free options as needed.

What can I serve with the burgers?

These burgers pair well with sweet potato fries or a fresh green salad for a complete meal.

Are there any allergen considerations?

Check for allergens in soy sauce, buns, and mayonnaise. Consider using gluten-free buns and vegan mayo if needed.

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Grilled Portobello and Avocado

Juicy grilled portobello mushrooms with avocado and fresh toppings.

Prep Time
15 min
Time to Cook
10 min
Overall Time
25 min
Created by Chloe Martin


Skill Level Easy

Cuisine Type American

Makes 4 Portions

Special Diets Vegetarian, No Dairy

What You’ll Need

Mushrooms & Marinade

01 4 large portobello mushroom caps, stems removed and gills scraped
02 3 tbsp olive oil
03 2 tbsp balsamic vinegar
04 2 tsp soy sauce (or tamari for gluten-free)
05 2 cloves garlic, minced
06 1 tsp dried oregano
07 ½ tsp 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 tbsp mayonnaise or vegan mayo
07 2 tsp Dijon mustard

How-To

Step 01

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

Step 02

Marinate 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 your grill (or grill pan) to medium-high heat.

Step 03

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

Step 04

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

Step 05

Assemble 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 remaining bun half.

Step 06

Serve: Serve immediately with your favorite side dishes.

Gear Needed

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

Allergy Details

Review every item for allergens and connect with your healthcare provider if you’re unsure.
  • Contains: Soy (in soy sauce)
  • Contains: Gluten (in buns, unless using gluten-free options)
  • Contains: Egg (in mayonnaise, unless using vegan mayo)

Nutrition Breakdown (each serving)

Info for reference only—don’t take this as expert medical guidance.
  • Caloric Value: 320
  • Lipids: 15 g
  • Carbohydrates: 38 g
  • Proteins: 7 g

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