Grilled Portobello Mushroom Burgers (Print View)

Marinated grilled portobello caps topped with avocado, tomato, lettuce and tangy sauce for a hearty vegetarian main.

# Components:

→ 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

09 - 4 burger buns (use gluten-free if needed)
10 - 1 ripe avocado, sliced
11 - 4 slices tomato
12 - 4 leaves lettuce (romaine or iceberg)
13 - ½ red onion, thinly sliced
14 - 4 tbsp mayonnaise or vegan mayo
15 - 2 tsp Dijon mustard

# Directions:

01 - In a small bowl, whisk together olive oil, balsamic vinegar, soy sauce, minced garlic, oregano, smoked paprika, salt, and pepper.
02 - 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.
03 - Grill the mushrooms, cap side down first, for 4–5 minutes per side, until tender and slightly charred.
04 - Toast burger buns lightly on the grill, if desired.
05 - 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.
06 - Serve immediately with your favorite side dishes.

# Expert Advice:

01 -
  • No one misses the meat when portobello caps soak up this tangy marinade.
  • Quick prep and fresh toppings make these burgers perfect for busy weeknights and relaxed weekends alike.
02 -
  • Never skip drying the mushrooms before marinating—they grill best when there’s no puddle of moisture clinging to them.
  • I used to marinate them for hours, but learned 15 minutes is plenty—longer can make them mushy instead of meaty.
03 -
  • Go for medium heat on the grill—too hot and the mushrooms dry out, not enough and they go limp instead of charred.
  • Brush leftover marinade over the mushrooms the last minute on the grill for extra shine and flavor.
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