Flank Steak with Roasted Mushrooms and Onions

Flank Steak and Roasted Mushrooms
In my circle of family and friends, I have to say there isn’t one male that doesn’t love beef in one form or another, especially a fork-tender steak.

The nutritionist in me has an opinion about eating beef that is sometimes contrary to popular belief. In a nutshell, I don’t see anything wrong with consuming beef unless you have a particular health issue that requires you to eliminate it from your diet.

There have been plenty of studies in both directions – pros and cons, but I liked this synopsis from Joy Bauer, a popular nutritionist. Along with Joy’s suggestions, I have a few of my own:

  • Stick with portion sizes – 4 ounces is plenty. It’s crazy when you go to a restaurant and the steak is the size of your dinner plate. I know we all want our money’s worth, but do yourself a favor and take half home, or split it with your partner.
  • Buy grass fed if you can afford to. Grass fed has higher levels of omega-3 fatty acids, but can be expensive and often has a gamier flavor and texture.
  • Buy the leanest cuts of steak and ground beef you can find.
  • Keep your beef eating to a few times a month. It doesn’t hurt any of us to cut down on the saturated fats found in all meats.
Okay – enough of that! Time to enjoy this luscious flank steak!

Flank Steak and Roasted Mushrooms

I’m a believer that flank steak is in need of a bit of tenderizing, so I slathered our meat with a spicy Dijon sauce, then let it sit for a few minutes to absorb the flavors.

Flank Steak and Roasted Mushrooms

In the meantime, instead of sautéing our mushrooms, I decided to skip the extra fat in the olive oil I would have used, and roast them instead. I’ve never roasted mushrooms, have you? They turned out amazing with a sprinkle of fresh thyme and onions in the pan.

Sliced into serving sized portions, our steak came off the grill cooked to my husband’s idea of perfection, and served with mushrooms and onions, this beef lover was a happy guy.

Leftover Steak, Mushrooms and Sun Dried Tomato Pocket Sandwiches with Basil Vinaigrette

I never throw out good food, and with just the two of us, there’s always leftovers. This pocket sandwich with sun dried tomatoes and a basil vinaigrette makes good use of the remainders of your flank steak.

It’s time to head off to work,. Although I could talk food the rest of the day and be happy, I don’t think my employer would be pleased. Have a terrific week!


Flank Steak with Roasted Mushrooms and Onions
Shake It Up! Not a mushroom fan? You could easily roast your favorite vegetable for equally delicious results. I'm an asparagus fan, and summer squash would be fantastic.
  • 1 ½ pounds flank steak
  • 2 tablespoons spicy brown mustard
  • 2 tablespoons Worcestershire sauce
  • 1 clove garlic, crushed
  • 1 tablespoon olive oil
  • ½ teaspoon onion powder, or 1 tablespoon minced onion
  • 1 large onion, thinly sliced
  • 6 cups mushrooms, quartered
  • 2 tablespoons fresh thyme, stripped from stems
  1. Preheat outdoor grill.
  2. Preheat oven to 450 degrees. Line a cookie sheet with foil and spray with cooking spray.
  3. Combine mustard, Worcestershire sauce, garlic, olive oil and onion powder in a small bowl. Spread over flank steak and allow to rest for 20 minutes.
  4. Combine mushrooms, onion and thyme on the cookie sheet and spray with cooking spray. Lightly sprinkle with salt and pepper. Roast for 20 minutes until tender.
  5. Grill steak until it reaches a temperature of 140. Remove from the heat and allow to sit for 10 minutes.
  6. Serve with mushrooms and onions.
Food energy: 344kcal
Saturated fatty acids: 5.62g
Monounsaturated fatty acids: 7.65g
Polyunsaturated fatty acids: 1.08g
Total fat: 14.34g
Calories from fat: 129
Cholesterol: 110mg
Carbohydrate, by difference: 9.48g
Total dietary fiber: 2.01g
Protein: 40.17g
Total lipid (fat): 16.28g
Water: 264.36g
Ash: 3.20g
Total sugars: 4.62g
Calcium: 69mg
Iron: 3.85mg
Magnesium: 55mg
Phosphorus: 447mg
Potassium: 1030mg
Sodium: 270mg
Nutrition Information
Serving size: 4

Disclaimer – the nutrition opinions are strictly my own. Consult a physician or licensed dietician if you have particular concerns.

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Thank you for sharing!



  1. says

    Mmmm, beef. 😉 We don’t have it a lot, but we do enjoy it. It’s ridiculous how big servings are in some restaurants, isn’t it? One of the reasons is they want to charge higher prices, so they give you a bit more food so you think you’re getting “value.” Of course if you don’t eat it all (and aren’t a doggy bag sort) it’s not value at all. Anyway, sorry about the off topic! Great looking recipe — thanks.

  2. says

    Mmmm….looks so good! I’m thinking dinner tonight, although I’ve already been to the store, so maybe next week! We usually eat beef once a week, and I agree with all of Joys tips :-) Can’t wait to make this!

    • says

      You’ll have to let me know how it turns out for you. Most often we have flank steak, but these days folks are on to the value, so it’s gone up in price. At least around here. Have a terrific Memorial Day weekend! :)

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