Portobello Burgers with Pesto, Provolone, and Roasted Peppers

Ingredients:

• 1/2 cup purchased pesto
• 1/4 cup mayonnaise
• 4 sourdough, whole grain, or ciabatta rolls, split horizontally
• 4 portobello mushrooms, stemmed, dark gills scraped out
• Olive oil
• Roasted red peppers from jar, drained
• 4 cups arugula (about 2 ounces)
• 1 cup coarsely grated mozzarella cheese (about 4 ounces)

Preparation:

* Stir pesto and mayonnaise in small bowl to blend. Season with salt and pepper.

* Prepare barbecue (medium-high heat). Grill rolls, cut side down, until lightly toasted. Transfer to plates. Spread grilled side of rolls with pesto mayonnaise.

* Brush mushrooms on both sides with oil; sprinkle with salt and pepper. Grill, rounded side up, 4 minutes. Turn mushrooms over. Cover and grill until mushrooms are tender, about 4 minutes. Place 1 mushroom on each roll bottom. Top each with enough red pepper pieces to cover, then with arugula and cheese. Press roll tops over and serve.