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Published January 12, 2016 | Last Updated October 5, 2021 By Barbara Bianchi 25 Comments

How To Make A Perfect Pan Seared Flat Iron Steak

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 This flat iron steak is the juiciest tenderest steak ever! This method is also excellent for a strip steak, rib-eye, or flank steak.

How To, Pan Seared Flat Iron Steak, steak, gluten free, paleo

You know those crazy days when you need to get dinner on the table quick, and you’d really rather have reservations booked at the fancy steakhouse?

Why not turn your own kitchen into a steakhouse? 😀

Today, I’m sharing my super easy steps for cooking the juiciest flat iron steak. Marinated and seared to perfection. And topped with a luscious red wine sauce.

And you might not guess it from the pictures, but this dish is super quick to make too. You’ll start marinating your steak earlier in the day, and when it’s time to cook, it takes just 20 minutes, tops.

Flat Iron Steak

This is one of my go-to gluten free and paleo meals. My teenage sons love it. Since they are working out, they are burning calories fast and have trouble putting on weight. Since steak is ruminant meat (cows get their nutrients from plant-based food), the meat has a high quality fat content.

What Is flat iron steak?

Flat iron steak is a thin lean steak cut from the shoulder portion, and it’s less expensive than some other cuts. As always, I recommend grass-fed beef. It’s healthier and contains more nutrients than its grain-fed counterpart.

finished meal on a plate

It sometimes can be difficult to find grass-fed beef in supermarkets (and often I’ve seen supermarkets overpricing these meats).  I’ve been ordering from a local supplier in upstate New York. If you’re not in New York, you may be able to locate a local farm in your area at this site.

close up of finished meal

So, what’s the secret to a really tender and juicy flat iron steak? Marinate it for at least 4 hours and then quickly pan sear it. After pan searing the steak, you can take the flavor to the next level by accompanying the steak with a sauce made from the pan drippings.

Ingredients 

steak
avocado oil
salt and pepper
For marinade:
red wine
extra-virgin olive oil
garlic, gluten-free Dijon mustard, and scallions
For sauce:
avocado oil
red wine
gluten-free beef broth
shallots
garlic
and salt and pepper

Instructions

*Free printable recipe card is available at the end of the post.

  • First, marinate your steaks for at least 4 hours before cooking.
  • Take steaks out of the refrigerator an hour before you’re ready to cook, if you can, to bring them to room temperature. Pat the steaks dry with paper towels, discard the marinade, and pound the steaks with a meat tenderizer.
  • Now, turn on your vent fan (the searing process can get a bit smokey). Heat oil in your skillet for a minute or two before adding the steak. I use refined avocado oil because it is very heat stable with one of the highest smoke points. This makes it one of the best possible oils for frying. It is also highly nutritious and loaded with antioxidants. Read all about its health benefits here.
  • After about 4 minutes, flip the steak over. Cook for another 4 minutes.
  • Now check the temperature with a meat thermometer. Lift the steak out of the skillet with tongs and insert the meat thermometer into the side of the steak. You may need another minute or two until the temperature reaches 140℉. Then the steak is done.
  • Let your meat rest on a platter for 10 minutes before slicing. The temperature will rise a little as it rests.
  • Slice the steak against the grain when you’re ready to serve.
  • While the steak rests, you can make the sauce right in the same pan. Rich-tasting shallots, garlic, and wine in a beef broth topped off with creamy butter make this sauce irresistible. Season with a dash of salt and pepper and serve with your steak.

Pro tips and recipe notes

  • This method is also excellent for a strip steak, rib-eye, or flank steak. Just adjust the timing depending on the thickness of your cut.
  • If you don’t have time to marinate, you don’t have to. But marinating will help make the meat extra flavorful.
  • It’s best to take steaks out of the refrigerator an hour before you’re ready to cook, if you can, to bring them to room temperature.
  • Pat the steaks dry with paper towels and pound the steaks with a meat tenderizer. A few whacks with the mallet softens the fibers of the meat, and your steak will turn out nice and tender.
  • When you’re ready to serve, thinly slice your steak against the grain.

How To, Pan Seared Flat Iron Steak, steak, gluten free, paleo

Voilà! A satisfying, juicy steak with a mouthwatering sauce. I served mine with roasted potatoes and baked zucchini sticks. If you’re following a low-carb way of eating, however, you may prefer serving yours with seasoned cauliflower rice with bacon or creamy cauliflower mash. Enjoy!

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Perfect Pan Seared Steak | Wine Sauce | Easy Marinated Flat Iron Steak | How to Tips

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4.20 from 5 votes

How To Make A Perfect Pan Seared Flat Iron Steak

So, what’s the secret to a really tender and juicy flat iron steak? Marinate it for at least 4 hours and then quickly pan sear it. After pan searing the steak, you can take the flavor to the next level by accompanying the steak with a sauce made from the pan drippings.
Course Dinner
Cuisine American
Keyword flat iron steak marinade, flat iron steak recipe, how to cook flat iron steak
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings 4
Calories 637kcal
Author Barbara Bianchi

Ingredients

  • 2 pounds flat iron steak
  • 2 tablespoons avocado oil
  • salt and pepper to taste
  • For marinade:
  • 1/2 cup red wine
  • 1/2 cup extra-virgin olive oil
  • 4 cloves garlic minced
  • 2 tablespoons gluten-free Dijon mustard
  • 3 scallions chopped
  • For sauce:
  • 1 tablespoon. avocado oil
  • 1/4 cup red wine
  • 1 cup of gluten-free beef broth homemade or store bought
  • 1 tablespoon shallots minced
  • 1 clove garlic minced
  • salt and pepper to taste

Instructions

  • For marinade: Mix wine, oil, garlic, dijon mustard and scallions in a shallow dish. Add steak, cover and marinate for at least 4 hours in the refrigerator. You can leave it to marinate for as long as 12 hours.
  • Cook: Pat steaks dry with paper towels. Pound with a meat tenderizer. Season with salt and pepper on both sides.
  • Now, heat oil in your skillet until it is very hot. Place steak on the pan for about 4 minutes.
  • Now you can flip it. Cook for another 4 minutes.
    Check the temperature and continue cooking until the inside temperature reaches 140℉. (You may have to turn the heat down a bit and cook another 1- 2 minutes on each side).
    Let your meat rest for 5-10 minutes before slicing. Thinly slice steak against the grain.
  • For sauce:
    Add one tablespoon of the oil to the same skillet and scrape up the brown bits from searing the steaks.
    Sauté the shallots until they've softened and turned golden, 2 to 3 minutes. Add 1/4 cup wine Reduce to about half by simmering for 3 minutes.
    Stir in broth and simmer to reduce again to about half. Whisk in 2 tablespoons of butter. Season with a dash of salt and pepper. Serve with your steak.

Notes

  • This method is also excellent for a strip steak, rib-eye, or flank steak. Just adjust the timing depending on the thickness of your cut.
  • If you don’t have time to marinate, you don’t have to. But marinating will help make the meat extra flavorful.
  • It's best to take steaks out of the refrigerator an hour before you’re ready to cook, if you can, to bring them to room temperature.
  • Pat the steaks dry with paper towels and pound the steaks with a meat tenderizer. A few whacks with the mallet softens the fibers of the meat, and your steak will turn out nice and tender.
  • When you're ready to serve, thinly slice your steak against the grain.

Nutrition

Calories: 637kcal
did you make this recipe? We want to see! Take a pic, and tag @glutenfreehomestead on Instagram.

Nutrition-Label-Embed-flat iron steak

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About Barbara Bianchi

Barbara loves to bring fun into the kitchen and healthy food to the table. She also enjoys drinking coffee, eating a little chocolate, reading a good novel, going for walks and spending time with her family and friends.
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  • Dr. Ted Naiman’s P:E Potatoes Au Gratin - August 5, 2022
  • Frozen Strawberry Protein Pops - July 28, 2022
  • High-Protein Smoothie With Strawberries - July 15, 2022
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Filed Under: Beef, Dairy free, Dinner, Egg free, LOW CARB, Most Popular Recipes, Nut free, Paleo, Recipe

Reader Interactions

Comments

  1. Kebba Buckley Button says

    January 12, 2016 at 10:36 pm

    5 stars
    Barbara, I’m visiting from the UBC, which is also where I originally found your work and how I originally subscribed to you.. Your recipes are luscious, specific, and easy to make. I must find out if I can get this cut of beef around here. Arizona has a big beef industry, but cuts of beef seem to go in trends. Is there a second name or second cut of beef we could treat similarly? Thanks for all your great work and recipes!

    Reply
    • Barbara says

      January 13, 2016 at 12:00 am

      Oh thank you, Kebba. I’m so glad that you’re enjoying the recipes. Yes, this method should be excellent for a strip steak, rib-eye, or flank steak. Just adjust the timing depending on the thickness of your cut. 🙂

      Reply
  2. Martha says

    January 12, 2016 at 11:26 pm

    5 stars
    That looks absolutely delicious! I’m always looking for quick and easy recipes so I can get dinner quick after work. Definitely going to try this.

    Reply
    • Barbara says

      January 13, 2016 at 10:26 pm

      Excellent. I hope you’ll come back and tell me how you like it. 🙂

      Reply
  3. Leigh says

    January 13, 2016 at 11:22 am

    Ladies, this looks awesome! I found you guys at A Little R & R Wednesdays.

    Reply
    • Barbara says

      January 13, 2016 at 10:26 pm

      Hi Leigh,
      Thank you! So glad you took the time to stop by and leave this note.

      Reply
  4. Marla says

    January 16, 2016 at 11:15 am

    5 stars
    Hi Barbara & Nicole,
    We get a quarter of organic grass fed beef from a local farmer every year. This recipe will come in handy when we get new steaks – its sounds and looks delicious. I always love a tender steak. Thanks for sharing on Real Food Fridays. Tweeted & pinned.

    Reply
    • Barbara says

      January 16, 2016 at 1:27 pm

      Terrific, Marla. You’re starting with the best beef. And thanks for sharing. I appreciate you. ❤

      Reply
  5. Helen Fern says

    January 18, 2016 at 12:47 pm

    This looks delicious. Would love to have you come and share at our party – What’s for Dinner

    https://www.lazygastronome.com/whats-for-dinner-sunday-link-up-27/

    Reply
    • Barbara says

      January 20, 2016 at 9:31 pm

      Thanks for inviting me. I’ll stop by for sure.

      Reply
      • Helen Fern says

        January 21, 2016 at 10:13 am

        Thanks for sharing!!

        Reply
  6. Emma says

    January 20, 2016 at 10:12 am

    OK this has got my mouth watering! My husband loves steaks and this sounds delicious. Thanks for linking with #freefromfridays

    Reply
    • Barbara says

      January 20, 2016 at 9:44 pm

      My husband loves a good steak, too. He couldn’t stop raving about this one and how perfectly it was cooked. We all love to hear that. Right? Thanks for stopping by. 🙂

      Reply
  7. Petra @ CrumblesAndKale says

    January 21, 2016 at 6:20 am

    Wow, this looks amazing and that marinade sounds just lovely. Have to try it someday 🙂

    Reply
  8. Raia says

    January 21, 2016 at 3:29 pm

    This looks amazing. 🙂 I’m awful at making steaks, so this will come in handy for me, for sure. 🙂 Thanks so much for sharing it at Savoring Saturdays!

    Reply
  9. BB Free says

    October 1, 2016 at 2:12 pm

    I’m going to try this. I always overcook this type of meat. Let’s see how it goes.

    Reply
    • Barbara says

      October 3, 2016 at 11:36 pm

      Hi, Bobbie! I can’t wait to hear how yours turns out. When the inside temp reaches 140℉, you’re good. 🙂

      Reply

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Hi! We’re Barbara & John. Whether you’re looking for delicious easy to follow gluten-free and low-carb recipes, strength training tips, strategies to beat chronic fatigue, or just because you want to feel good, you're in the right place. Read more here. 

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