Bobby's Lighter Mushroom Burger - Paula Deen

Ingredients

• 4 large portobello mushroom caps
• 3 tablespoons balsamic vinegar
• 1 tablespoon extra-virgin olive oil
• ½ teaspoon salt
• ¼ teaspoon coarsely ground black pepper
• 4 large slices whole-grain peasant bread
• ½ cup light mayonnaise
• 1 tablespoon fresh chopped rosemary
• 1 cup Baby arugula
• 1 large tomato
• 1 small red onion
• ½ cup roasted red pepper strips