The Best Grilled Portobello Mushroom Burger Recipe

Ingredients For The Best Grilled Portobello Mushroom Burger Recipe

• 4 portobello mushroom caps
• 2 tablespoon balsamic vinegar
• 1 tablespoon low sodium soy sauce
• 1 tablespoon olive oil
• 1 tablespoon chopped rosemary
• 1.5 teaspoon steak seasoning like Montreal Steak Grill Mates
• 4 thick slices red onion
• 4 ounce reduced fat Swiss, sliced thin
• 4 thin slices tomato
• 0.5 avocado, sliced thin
• baby spinach
• 4 whole wheat low calorie buns, I used Martin