There’s nothing quite like a perfect grilled steak and so I’m sharing my secrets on Grilled Flank Steak and my favorite balsamic marinade. 

a cutting board with roasted yukon gold potatoes and sliced grilled flank steak with a delicious marinade

We went over to one of our friends’ home the other night for dinner. We brought the meat and salad and they supplied side and dessert (oh my gosh it was the most delicious strawberry shortcake. A true favorite of mine!)

I got this recipe from a girl I went to Elementary and Junior High School with. Fast forward 5,000 years, we became friends on facebook and the rest is history! 

Anyway, this is hands down our new favorite way to cook flank steak. If there is one meat recipe you try from me this weekend, make it this one. You will love it forever.

a sliced flank steak that has been cooked on a gas grill with a balsamic soy sauce marinade

What is Flank Steak?

Flank steak is a somewhat tough but lean cut of beef that is long and flat. It is still quite flavorful but it mostly benefits from a marinade that tenderizes the meat.

Prepared this way, marinated, cooked quickly at high heat, and thinly sliced, flank steak practically melts in your mouth.

What’s in the Marinade?

At first glance, this flank steak recipe might look like a lot of ingredients, but you’ll likely have most of them in your pantry or fridge already. Here is everything you will need…

  • Soy Sauce– This adds a lot of flavor and a touch of salt to balance out the sweetness in the marinade.
  • Oil– Vegetable is what we use, but you could use olive oil.
  • Dark Brown Sugar– Dark brown sugar gives a touch of sweet and balances the salty of the soy sauce, but we prefer dark brown sugar to add a little more depth of flavor.
  • Worcestershire Sauce– Umami is the flavor you forget about. Yes, there’s sweet, salty, bitter, sour but did you know umami is that earthy goodness? Worcestershire enhances that in a beef marinade.
  • Dijon Mustard– A strong but not bitter mustard that helps to enhance flavor.
  • Garlic– Garlic breaks up the muddled flavors in a beef dish, adding a stitch of a bite.
  • Chives- A more mild onion flavor that also adds a little freshness.
  • Pepper- While we don’t need to add salt thanks to the soy sauce we do need a little heat from the pepper.
  • Balsamic Vinegar- Acid is one of the key components in cooking as you’ll read in our cookbook, Raised in the Kitchen. It cuts through the flavors, tenderizes the meat and adds a sweet but tangy flavor.

What to Use if You Can’t Find Flank Steak

A great substitution for flank steak is a skirt steak or flat iron steak. We loooove skirt steak!!

What is Another Name for Flank Steak?

Some butchers sell flank steak under the name “London Broil,” while others use that term for cuts from the round.

roasted yukon gold potatoes with a grilled flank steak sliced thinly

How to Keep Flank Steak Tender

Flank steak has a lot of muscle fibers running through it, and it is a fairly lean cut of meat. It has an intense beefy flavor, but it can be a little tough.

  • It should be thinly sliced and cut against the grain. Look for which way the lines are running through the meat and cut the opposite direction. This will give it maximum tenderness.
  • Marinades can also help it to be tender. 
  • Let it rest! Once it has cooked, remove it from the grill and set it aside to rest for about 5 minutes. This allows juices to redistribute and the meat will be more flavorful and tender. 

How Should Flank Steak be Cooked

  • Grilling is the best way to cook flank steak, as it caramelizes the flavor on the outside, adding a nice sear but you can still control the inner temperature.
  • To keep your flank steak grill time to a minimum. Start with a high heat to sear both sides then turn it down to medium and only cook for about 9-12 minutes total.
  • Because this is a lean cut, it is best cooked rare, medium-rare, or medium. I would never cook a flank steak to well done. 
  • Additionally, you can also pan-sear it in a skillet or broil it in your oven, but you will lack flavor.

What to Eat with Flank Steak

We like to eat flank steak as the main dish with a side of mashed potatoes or roasted fingerlings. A side salad or any vegetable also makes a great side dish like grilled corn on the cob or roasted garlic veggies.

This steak can also be used to make a great steak salad or sliced thin and served in flank steak tacos.

thinly sliced flank steak that marinated in a balsamic marinade all day

This balsamic flank steak marinade is bold in flavor and makes the most tender, juicy steak! It’s a staple in our summer grilling rotation! 

Flank Steak

4.04 from 80 votes
Servings: 4
Prep Time: 8 hours 10 minutes
Cook Time: 15 minutes
Total Time: 8 hours 25 minutes


A delicious flank steak marinade that brings the often tough flank steak to a mouthwateringly tender cut of steak.


  • 2 Pounds Flank Steak
  • 1/2 Cup Soy Sauce
  • 1/3 Cup Vegetable Oil
  • 2 Tablespoons Dark Brown Sugar
  • 1/4 Cup Worcestershire Sauce
  • 1 teaspoon Dijon Mustard
  • 4 Cloves Garlic, medium, minced
  • 2 Tablespoons Chives, minced, fresh
  • 1 1/2 teaspoons Ground Black Pepper
  • 2 teaspoons Balsamic Vinegar


  • Mix all ingredients together in a ziploc or a large dish.
    1/2 Cup Soy Sauce, 1/3 Cup Vegetable Oil, 2 Tablespoons Dark Brown Sugar, 1/4 Cup Worcestershire Sauce, 1 teaspoon Dijon Mustard, 4 Cloves Garlic, 2 Tablespoons Chives, 1 1/2 teaspoons Ground Black Pepper, 2 teaspoons Balsamic Vinegar
  • Add the flank steak and marinate (covered) in the fridge overnight or at least all day.
    2 Pounds Flank Steak
  • Heat the gas grill to high heat. Remove the steak from the marinade and lay on the grill for 2 minutes per side. Then turn down to medium and cook another 7-10 minutes, flipping halfway again, or until an internal temperature of 130 degrees F (using a meat thermometer) for medium rare, or longer for medium etc. Remove and set aside to rest on a cutting board with foil draped over the top.
  • Meanwhile, place 1/2 of the remaining marinade in a sauce pan over medium heat.
  • Bring the marinade to a simmer for 10 minutes, set aside.
  • Slice the steak against the grain and serve with a drizzle of additional sauce if desired.


Flank steak is a lower quality of meat so cooking to well done will make it more chewy. It’s incredibly flavorful and delicious when cooked properly!!
Store left overs for 3-4 days in the refrigerator.


Serving: 1gCalories: 374kcalCarbohydrates: 13gProtein: 52gFat: 11gSaturated Fat: 5gPolyunsaturated Fat: 1gMonounsaturated Fat: 5gCholesterol: 136mgSodium: 1980mgPotassium: 1011mgFiber: 1gSugar: 8gVitamin A: 84IUVitamin C: 4mgCalcium: 88mgIron: 5mg
Author: Sweet Basil
Course: 100 + BEST Easy Beef Recipes for Dinner

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a cutting board with roasted yukon gold potatoes and sliced grilled flank steak with a delicious marinade