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Portobello and Flank Steak over Greens

Prep time 19 mins
Cook time 20 mins
Other time 2 hrs, 35 mins
Yield 6 servings (serving size: 1 cup salad, about 3/4 cup mushroom mixture, 3 ounces steak, and 1 tablespoon dressing)
Allowing the steak to stand before cutting it preserves the juices and makes for easier slicing. To enhance the steak's tenderness, cut the meat diagonally across the grain.


  • 1/2 cup balsamic vinegar
  • 1/3 cup olive oil
  • 1 tablespoon Worcestershire sauce
  • 1/2 teaspoon kosher salt
  • 1/2 teaspoon freshly ground black pepper
  • 2 garlic cloves, minced
  • 1 (1 1/2-pound) flank steak, trimmed
  • 6 large portobello mushroom caps
  • 1 large red onion, cut into 1/2-inch-thick slices
  • Cooking spray
  • 6 cups mixed salad greens
  • 1 cup halved cherry tomatoes

Nutrition Information

  • calories 283
  • fat 13.6 g
  • satfat 3.4 g
  • protein 28 g
  • carbohydrate 11.8 g
  • cholesterol 38 mg
  • iron 3.3 mg
  • sodium 223 mg
  • caloriesfromfat 43 %
  • fiber 3.2 g
  • calcium 77 mg

How to Make It

  1. Combine first 6 ingredients in a small bowl, stirring with a whisk until blended.

  2. . Combine steak, mushrooms, and onion in a large zip-top plastic bag. Add 1/2 cup vinegar mixture to bag; seal. Marinate in refrigerator 2 1/2 hours, turning occasionally. Reserve remaining 6 tablespoons vinegar mixture.

  3. . Prepare grill.

  4. . Remove steak and onion from bag, and place on grill rack coated with cooking spray. Grill 6 to 8 minutes on each side or until steak is desired degree of doneness and onion is tender. Remove mushrooms from bag; discard marinade. Place mushrooms on grill rack; grill 4 to 5 minutes on each side or until tender. Cut mushrooms into 1/2-inch-thick slices. Let steak stand 5 minutes. Cut steak diagonally across grain into thin slices.

  5. . Chop onion; combine onion and mushrooms in a medium bowl. Combine mixed greens and tomatoes, and arrange evenly on plates. Top evenly with mushroom mixture. Arrange steak evenly over mushroom mixture; drizzle each serving evenly with reserved vinegar mixture. Serve immediately.

Oxmoor House Healthy Eating Collection