Balsamic Roasted Portobello Sandwich

Balsamic Roasted Portobello Sandwich


  • Aunt Millie's Deli Onion Hamburger Buns
  • 4 large Portobello mushrooms
  • ½ cup balsamic salad dressing
  • 2 red peppers, sliced
  • 1 small red onion, sliced
  • ½ cup low-fat mayonnaise
  • ¼ cup Parmesan cheese
  • Juice of half a lemon
  • Salt, to taste
  • Pepper, to taste


  1. Preheat the oven or grill to 400°F.
  2. Place mushrooms, peppers, and onions onto a large baking sheet. Drizzle the vegetables with the balsamic dressing and toss. Bake or grill until nicely browned.
  3. Meanwhile, combine the mayonnaise, cheese, and lemon juice together in a small bowl. Salt and pepper to taste.
  4. Spread 4 hamburger buns with the desired amount of Parmesan mayonnaise, and top each with grilled vegetables.
  5. Serve immediately.

Onion buns

Aunt Millie's Deli Onion Hamburger Buns