This sous vide flank steak is melt in your mouth delicious! It is easy and simple to make but yields big flavor. This method of cooking flank steak yields perfect results every time.

Sous vide flank steak on white plate

Why You’ll Love This Recipe

  • This sous vide flank steak is easy and mostly hands off.
  • It is impossible to overcook the steak.
  • No grilling or oven needed.
  • Let the sous vide do all the hard work for you!
  • The steak comes out so tender and delicious.
  • It is not dry, overdone or flavorless.
  • This recipe is Whole30 compliant, Paleo, gluten free, dairy free, Keto, low carb and sugar free.
  • Check out these Sous Vide Chicken Thighs for another great recipe.

Ingredients & Substitutions

These are the main ingredients and substitutions. Scroll down to the recipe card for full ingredients list and instructions.

Use a high quality flank steak. Look for a steak that has an even thickness throughout. For best results, use a fresh steak instead of frozen. If using frozen, thaw beforehand.

A little sea salt and pepper is the only seasoning used. This allows the natural flavor of the flank steak to shine.

Balsamic vinegar adds a great slightly sweet, tart and dark flavor. If desired, red wine or red wine vinegar can be used.

The olive oil is used to sear the steak. Avocado oil, butter or ghee can be used as well.

Fresh thyme is a great garnish. It adds a pop of color and freshness. Feel free to omit if desired.

Flank steak and other ingredients

Water Displacement Method

The water displacement method is a technique used for sous vide cooking. This method uses a zippered bag instead of a vacuum sealed bag. If using a vacuum sealed bag, place directly into the water bath.

For a zippered bag, follow these steps.

Fill zippered bag with food. Then, slowly lower bag into water bath.

The pressure from the water bath will suck out all of the air inside the bag.

Once the bag contains no air, zipper shut and fully submerge.

Taste & Texture

This sous vide flank steak is hearty, savory and flavorful.

The texture is so tender. This steak is melt in your mouth tasty!

How to Make

Step 1

First, add water to large pot. Set sous vide to 131 degrees Fahrenheit.

Sous vide machine in water

Step 2

Season flank steak on both sides with sea salt and pepper. Place steak in a large zipper bag. Add in balsamic vinegar.

Step 3

Leave the bag unzipped. Once water bath has heated to 131 degrees, slowly lower bag into water. As it lowers, the air will be sucked out of the bag. Once the air is out, zip lock bag.

Meat in water bath

Step 4

Set timer to 90 minutes.

Step 5

After the timer goes off, carefully remove bag from water bath. Remove steak from bag and pat dry with paper towels.

Step 6

Heat olive oil in a large skillet over medium high heat.

Step 7

Once oil is hot, carefully place steak and fresh thyme in skillet. Sear on each side for 2 minutes.

Seared steak in pan

Step 8

Finally, place steak on a cutting board. Allow it to sit for 5 minutes to lock in juices.

Step 9

Carefully slice and serve. Garnish with more fresh thyme if desired.

Sliced steak on cutting board

Expert Tips & Tricks

Searing the sous vide flank steak gives it a nice color and texture. Do not skip this step.

Allow the steak to sit for 5 to 10 minutes after searing to lock in juices. This yields extra tender steak.

How to Sear

As previously mentioned, searing the sous vide flank steak provides a beautiful color.

Here are some things to keep in mind while searing flank steak.

Get the oil hot before adding the steak to the skillet. This will produce a better color in shorter time.

Sear for only 2 minutes on each side. The goal of searing is to get that color, not continue cooking the steak more.

How to Serve & Store

Serve sous vide flank steak with roasted veggies, mashed potatoes, or a side salad.

Store leftovers in the fridge for up to 4 days.

Frequently Asked Questions

How long does it take to sous vide a steak?

It only takes 90 minutes to sous vide a flank steak.

Do you need to marinate before sous vide?

No, you do not need to marinate steak before sous vide.

Can I use frozen flank steak?

Sure. Add at least 1 hour to your cooking time.

Can I use another cut of steak?

Check out this Sous Vide Tri Tip for another great recipe! Otherwise, time and temperature will vary depending on steak cut.

Sous vide flank steak on cutting board

You May Also Like

If you make this recipe sous vide flank steak, I would really appreciate a review! You can find me on InstagramFacebook, and Pinterest. I would love for you to follow along!  For more ideas, check out these Dinner Recipes.

Sous vide flank steak on white plate

Get the Recipe: Sous Vide Flank Steak

This sous vide flank steak is so tender and flavorful! It is easy to make, savory and hearty. The steak is melt in your mouth delicious!
5 from 7 votes

Ingredients

Instructions 

  • First, add water to large pot and set sous vide to 131 degrees Fahrenheit.
  • Season flank steak on both sides with sea salt and pepper. Place steak in a large zipper bag. Add in balsamic vinegar.
  • Leave the bag unzipped. Once water bath has heated to 131 degrees, slowly lower bag into water. As it lowers, the air will be sucked out of the bag. Once the air is out, zip lock bag.
  • Set timer to 90 minutes.
  • After the timer goes off, carefully remove bag from water bath. Remove steak from bag and pat dry with paper towels.
  • Heat olive oil in a large skillet over medium high heat.
  • Once oil is hot, carefully place steak and fresh thyme in skillet. Sear on each side for 2 minutes.
  • Finally, place steak on a cutting board. Allow it to sit for 5 minutes to lock in juices.
  • Carefully slice and serve. Garnish with more fresh thyme if desired.

Notes

  • If using frozen flank steak, add at least 1 hour to cooking time.
  • Searing the steak gives it a nice color.  I highly recommend not skipping this step.
  • Allow the steak to rest for 5 to 10 minutes after searing before slicing into.  This yields an extra juicy tender steak.
  • Store leftovers in the fridge for up to 4 days.
Calories: 273kcal, Carbohydrates: 2g, Protein: 37g, Fat: 12g, Saturated Fat: 4g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 6g, Cholesterol: 102mg, Sodium: 841mg, Potassium: 587mg, Fiber: 1g, Sugar: 1g, Vitamin A: 3IU, Calcium: 38mg, Iron: 3mg

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