Kings Flat Iron Steak Sandwich

Kings Flat Iron Steak Sandwich

Jackie B. 1

"My husband drools when this is made. It is a perfect balance of flavors and leaves you full and wanting more the next day!"

Ingredients 35 m {{adjustedServings}} servings 890 cals

Serving size has been adjusted!

Original recipe yields 4 servings



Amount per serving ({{servings}} total)

  • Calories:
  • 890 kcal
  • 45%
  • Fat:
  • 54.5 g
  • 84%
  • Carbs:
  • 43.2g
  • 14%
  • Protein:
  • 59.5 g
  • 119%
  • Cholesterol:
  • 161 mg
  • 54%
  • Sodium:
  • 1134 mg
  • 45%

Based on a 2,000 calorie diet

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  • Prep

  • Cook

  • Ready In

  1. Preheat an oven broiler on high heat.
  2. Open the sandwich rolls and spread each with about 1 teaspoon of softened butter. Sprinkle each buttered sandwich roll with about 1/2 teaspoon garlic powder.
  3. Broil the sandwich rolls about 5 minutes, until the edges are slightly charred. Set aside.
  4. Heat a large, heavy skillet over high heat, and add the vegetable oil. When oil just begins to smoke, drop in the flat iron steaks and quickly sear until steaks are browned, about 3 minutes. Flip the steaks and sear the other side for another 3 minutes; remove steaks immediately, or lower the burner temperature and cook to the desired degree of doneness. Set steaks aside and keep warm.
  5. Assemble each sandwich roll with spinach leaves, tomato and avocado slices on one side, and 2 slices of mozzarella cheese on the other side. Sprinkle the tomato and avocado side with about 1/2 teaspoon of balsamic vinegar, and place a hot browned steak on the mozzarella cheese. Fold each sandwich closed to serve.
Tips & Tricks
Beef Brisket Sandwich

Incredibly tender beef brisket is piled high on a hoagie roll.

Grilled Cheese Sandwich

Just add cheese and toast till it's golden brown.

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Reviews 12

  1. 17 Ratings


This was very good - unfortunately flat irons are not available in my area but my butcher recommended sirloin steak instead. Everyone, even the kids, loved it. We will be enjoying this one again. Thanks!

Paul in Holmes NY

Anyone who likes steak is sure to love this. I made a bunch of them. Some I used Mozzerella but I ran short on that and put Bleu Cheese on the others. The result was KILLER. The Bleu cheese and balsamic made a great combo. Either cheese was great, but if you like sharp, try some bleu cheese you will not be disapointed!


One word, awesome! local grocery store was out of flat iron steaks so I used skirt...only thing I did different was I added a healthy amount of salt and pepper to the sliced tomato and avocado...I also added some purple onion...instead of waiting to the end to drizzle with balsamic, i added about 3 cap fulls to the oil when cooking the meat...wife loved it, will definitely make again...if using skirt steak, make sure to cook quickly over high heat and always cut against the grain...enjoy!