Grilled Portobello Burgers

• 4 large portobello mushrooms (4 to 4-1/2 inches), stems removed
• 6 tablespoons reduced-fat balsamic vinaigrette, divided
• 4 slices red onion
• 1 cup roasted sweet red peppers, drained
• 3 ounces fresh mozzarella cheese, cut into 4 slices
• 4 kaiser rolls, split
• 1/4 cup fat-free mayonnaise

1. Brush mushrooms with 4 tablespoons vinaigrette. Grill mushrooms and onion, covered, over medium heat 3-4 minutes on each side or until tender. Top mushrooms with red peppers, onion and cheese. Grill, covered, 2-3 minutes longer or until cheese is melted. Grill rolls, cut side down, 1-2 minutes or until toasted.
2. Spread roll bottoms with mayonnaise and drizzle with remaining vinaigrette. Top with mushrooms; replace roll tops.

portobello mushrooms, balsamic vinaigrette, red onion, sweet red peppers, mozzarella cheese, kaiser rolls, mayonnaise

Taken from www.tasteofhome.com/recipes/grilled-portobello-burgers/ (may not work)