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The Best Grilled Portobello Mushroom Burgers

"I set out to make a great tasting grilled portobello mushroom burger that even a meat lover would love. The mushrooms are marinated then grilled and topped with melted Swiss Cheese, grilled red onion,  tomatoes, spinach, and avocado – yum!!..."

INGREDIENTS
4 portobello mushroom caps
2 tbsp balsamic vinegar
1 tbsp low sodium soy sauce
1 tablespoons olive oil
1 tbsp chopped rosemary
1-1/2 tsp steak seasoning like Montreal Steak Grill Mates
4 thick slices red onion
4 oz reduced fat Swiss (sliced thin (Alpine lace))
4 thin slices tomato
1/2 avocado (sliced thin)
baby spinach
4 whole wheat low calorie buns (I used Martin)
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