- Whisk 2 tablespoons oil, vinegar and garlic in a bowl. Brush the mixture all over mushrooms and let stand for 30 minutes.
- Meanwhile, heat the remaining 1 tablespoon oil in a large skillet over high heat. Add onion and cook, stirring frequently, until beginning to brown, about 5 minutes. Reduce heat to low, add water and cook, stirring frequently, until the onion is browned and very soft, about 15 minutes. Add port; cook, stirring occasionally, until mostly evaporated, about 3 minutes more. Stir in 1/4 teaspoon salt and 1/8 teaspoon pepper. Remove from the heat and cover.
- Preheat grill to medium.
- Sprinkle the mushrooms with the remaining 1/4 teaspoon salt and 1/8 teaspoon pepper. Grill, gill-side down, for 5 minutes. Turn over and top each with 2 tablespoons cheese. Grill until the mushrooms are tender, 4 to 5 minutes more.
- Toast buns. Divide the onions among the mushrooms. Serve (cheese-side up) on buns with arugula and tomato.
More From Kitchen Daily:
Provided by: EatingWell
Per Single Serving / Serves 4 Total
- Calories 359 25%
- Calories from fat 144 3%
- Total Fat 16gm 28%
- Sodium 676mg 28%
- Total Carbohydrates 42gm
- Fiber 7gm
- Protein 12gm
- Cholesterol 8mg 14%
Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.