Foolproof Flat Iron Steaks


My special recipe combines balsamic vinegar, olive oil, and spices creating a simple, delicious marinade. My technique yields the most tender and juicy steak.

close up view of sliced Flat Iron Steak over salad on a platter
Prep Time:
15 mins
Cook Time:
15 mins
Additional Time:
1 hrs 5 mins
Total Time:
1 hrs 35 mins
4 servings


  • 2 (1 pound) flat iron steaks

  • ¼ cup balsamic vinegar

  • 3 tablespoons extra virgin olive oil

  • 3 tablespoons finely chopped green onions

  • 4 cloves garlic, minced

  • 1 tablespoon soy sauce

  • 1 teaspoon chopped fresh thyme

  • ½ teaspoon dry mustard

  • ¼ teaspoon ground black pepper


  1. Place steaks, balsamic vinegar, olive oil, green onions, garlic, soy sauce, thyme, mustard, and black pepper in an extra large resealable plastic bag, squeeze out excess air, and seal the bag. Knead the bag with your hands to distribute ingredients evenly and completely coat the steaks. Marinate in the refrigerator for 1 hour.

  2. Preheat grill for medium-high heat and lightly oil the grate. Remove steaks from refrigerator and let sit at room temperature for 10 minutes.

  3. Remove steaks from bag and discard marinade.

  4. Cook steaks on the preheated grill until they start to firm and are reddish-pink and juicy in the center, 6 to 7 minutes per side. An instant-read thermometer inserted into the center should read 130 degrees F (54 degrees C). Remove steaks to a plate and let rest for 5 minutes before slicing.

Editor's Note:

The nutrition data for this recipe includes the full amount of the marinade ingredients. The actual amount of the marinade consumed will vary.

Nutrition Facts (per serving)

537 Calories
36g Fat
4g Carbs
47g Protein
Nutrition Facts
Servings Per Recipe 4
Calories 537
% Daily Value *
Total Fat 36g 47%
Saturated Fat 12g 58%
Cholesterol 155mg 52%
Sodium 376mg 16%
Total Carbohydrate 4g 2%
Dietary Fiber 0g 1%
Total Sugars 2g
Protein 47g
Vitamin C 2mg 11%
Calcium 16mg 1%
Iron 0mg 2%
Potassium 48mg 1%

* Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

** Nutrient information is not available for all ingredients. Amount is based on available nutrient data.

(-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.

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