How to make the best Grilled Portobello Mushrooms. Simple recipe that’s perfect for a portobello steak, grilled portobello mushroom burger, or easy side.Prep: 10 minsCook: 6 minsTotal: 25 minsServings: 4 servingsIngredients4 large portobello mushrooms stems and gills removed, wiped clean1/4 cup balsamic vinegar1 tablespoon extra virgin olive oil1 tablespoon low sodium soy sauce1 tablespoon chopped fresh rosemary or 1/2 teaspoon dried1 teaspoon garlic powder1/2 teaspoon black pepper1/8 teaspoon cayenne…
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