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Grilled Portobello Mushroom Burger - Juicy, Smoky, and Satisfying

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Prep Time 15 minutes
Cook Time 12 minutes
Total Time 27 minutes
Servings: 4 servings
Ingredients Method

Ingredients
  

  • 4 large portobello mushroom caps, stems removed, gills scraped (optional)
  • 3 tablespoons olive oil
  • 2 tablespoons balsamic vinegar
  • 2 teaspoons soy sauce or tamari
  • 2 cloves garlic, minced
  • 1 teaspoon Dijon mustard
  • 1/2 teaspoon smoked paprika
  • Salt and black pepper
  • 4 burger buns (brioche, whole wheat, or gluten-free)
  • 4 slices provolone, Swiss, or vegan cheese (optional)
  • Lettuce or arugula
  • 1 ripe tomato, sliced
  • Red onion, thinly sliced
  • Pickles (optional)
  • 2 tablespoons mayonnaise or vegan mayo
  • 1 tablespoon grainy mustard

Method
 

  1. Prep the mushrooms: Wipe caps clean with a damp towel. Remove stems. Scrape gills if you want a milder taste and less mess.
  2. Make the marinade: In a bowl, whisk olive oil, balsamic, soy sauce, garlic, Dijon, smoked paprika, a pinch of salt, and pepper.
  3. Marinate: Place mushrooms gill-side up in a shallow dish. Spoon marinade over and rub to coat. Let sit 15–30 minutes, flipping once.
  4. Preheat the grill: Heat a gas or charcoal grill to medium-high. Oil the grates to prevent sticking. A grill pan on the stove works too.
  5. Grill the caps: Place mushrooms on the grill, gill-side down first, 4–5 minutes. Flip, brush with extra marinade, and cook another 3–4 minutes until tender and lightly charred.
  6. Add cheese (optional): In the last minute, add a cheese slice to each cap and close the lid to melt.
  7. Toast the buns: Split buns and toast cut-side down for 30–60 seconds until lightly crisp.
  8. Mix the spread: Stir mayo with grainy mustard. Season with a pinch of salt and pepper.
  9. Assemble: Spread the bun with the mayo-mustard. Layer lettuce, mushroom, tomato, onion, and pickles. Top with the other bun.
  10. Serve: Eat right away while the caps are juicy and warm.