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Portobello Mushroom Burger Recipe

American · Main course · 25 min total

A hearty and flavorful vegetarian burger featuring grilled portobello mushrooms, perfect for a satisfying meal.

Ingredients

• 4 large portobello mushroom caps, stems removed
• 1/4 cup balsamic vinegar
• 2 tablespoons olive oil
• 2 cloves garlic, minced
• 1 teaspoon dried thyme
• Salt and pepper to taste
• 4 hamburger buns, split and toasted
• 4 slices provolone or Swiss cheese
• 1 cup fresh spinach leaves
• 1 large tomato, sliced
• 1/2 red onion, thinly sliced
• 4 tablespoons mayonnaise or aioli

Instructions

1. In a small bowl, whisk together balsamic vinegar, olive oil, minced garlic, dried thyme, salt, and pepper.
2. Place portobello mushrooms in a shallow dish and pour the marinade over them. Let marinate for at least 10 minutes, turning once.
3. Preheat grill or grill pan to medium-high heat.
4. Grill mushrooms for 4-5 minutes per side, until tender and grill marks appear. During the last minute, top each mushroom with a slice of cheese and cover to melt.
5. Toast the hamburger buns on the grill for about 1 minute.
6. Spread mayonnaise or aioli on the bottom half of each bun.
7. Assemble burgers: place a cheese-topped mushroom on each bun, then add spinach, tomato slices, and red onion. Top with the other half of the bun.
8. Serve immediately.

Tips

• For extra flavor, add roasted red peppers or avocado slices.
• Serve with sweet potato fries or a side salad.
• If using a grill pan, ensure it is well-oiled to prevent sticking.

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