You don't miss the meat on this hearty burger. The veggies, mayo and cheese fill you up with plenty of flavor. —Mary Haas, Hewitt, New Jersey

Grilled Portobello Burgers

Ingredients
- 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
Directions
- 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.
- Spread roll bottoms with mayonnaise and drizzle with remaining vinaigrette. Top with mushrooms; replace roll tops.
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