Ingredients for 2 burgers:
4 large portabella mushroom caps
2 tablespoons olive oil
1 teaspoon dried basil
1 teaspoon dried oregano
1 tablespoon minced garlic
4 slices provolone cheese
Garlic mayo (1 tablespoon mayo mixed with 1 clove garlic, crushed)
In a small bowl, whisk together oil, basil, oregano, garlic, salt, and pepper.
Brush the mushrooms generously with the olive oil mixture.
Preheat grill for medium-high heat.
Brush grate with oil. Place mushrooms on the grill, stem side down.
Grill for 5 to 8 minutes on each side, or until tender.
Top with cheese during the last 2 minutes of grilling.
Put 2 mushroom caps on a bun with garlic mayo, roasted red pepper, red onion and arugula.