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Grilled Balsamic and Soy Marinated Flank Steak

Rated as 4.75 out of 5 Stars

"Flank steak is a perfect grilling meat. It's marbleized with fat that melts while grilling and fills the meat with the flavor of natural juices. If you have a lot of marinade leftover from this recipe, save it in your refrigerator and use it to marinate other grilled meats or chicken; it will last up to one week."
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55 m servings 307
Original recipe yields 4 servings


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  1. Whisk onion, garlic, olive oil, balsamic vinegar, soy sauce, Dijon mustard, rosemary, salt, and pepper together in a mixing bowl.
  2. Put the flank steak in a large resealable plastic bag. Pour marinade into the bag and coat steak with the marinade. Squeeze excess air from the bag and seal. Marinate in the refrigerator at least 30 minutes, up to 2 days.
  3. Preheat an outdoor grill for medium-high heat and lightly oil the grate.
  4. Remove the flank steak from the marinade and shake to remove excess liquid. Reserve marinade.
  5. Cook steak until firm, hot in the center, and just turning from pink to grey, 6 to 8 minutes per side, brushing occasionally with reserved marinade. An instant-read thermometer inserted into the center should read 150 degrees F (65 degrees C). Remove steak to a cutting board and rest meat 5 minutes before slicing thinly across the grain.


  • Cook's Notes:
  • The nutrition data for this recipe includes the full amount of the marinade ingredients. The actual amount of the marinade consumed will vary.
  • If you wish to serve extra marinade with the finished beef, pour marinade into a small saucepan and bring to a boil over high heat. Reduce heat to medium-low and simmer 10 minutes.
  • Partner Tip
  • Reynolds® Aluminum foil can be used to keep food moist, cook it evenly, and make clean-up easier.

Nutrition Facts

Per Serving: 307 calories; 20.5 8 22 38 1622 Full nutrition

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Read all reviews 77
  1. 99 Ratings

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Most helpful positive review

This was a very flavorful marinade. The london broil came out very tender. I didn't add any salt because the soy sauce is salty enough for us. This will definitely be in the rotation!

Most helpful critical review

It tasted like it was marinated in vinegar only. Three of us ate it and all agreed. Would never make a gain

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Least positive

This was a very flavorful marinade. The london broil came out very tender. I didn't add any salt because the soy sauce is salty enough for us. This will definitely be in the rotation!

LOVED THIS! Yes, truly! I used the exact ingredients except went short on the salt, but I didn't need to. I would not cook this meat as written, however, as you can tell by my photo! When cu...

AMAZING! Made exactly as recipe called for. I let it marinate for 7 hours and the flavor was delish! The hubby said one of the best steaks he has ever had.

WONDERFUL WONDERFUL WONDERFUL! Did this exactly as written, marinated for 24 hours and we'll do this again over and over without changing one thing!

I didn't have any Dijon mustard but used some honey mustard I had. I marinaded a flank steak for about 40 hours. The steak was moist and flavorful. The only change I would make is cooking the st...

Loved this recipe. Only had time to marinade for 30 minutes and it was delicious! Want to try it again with more marinating time. This is a keeper.

Absolutely outstanding! I had a 2 pound flank steak, so the cooking time was 3 minutes longer for it to come out medium rare. Other than that I used yellow mustard because that was all we had i...

Used Pomegranate Balsamic Vinegar as it was all I had on hand. Wasn't crazy about the taste of the marinade, but let the steak marinate in the fridge for 2 days. Really like the results.

This recipe was awesome and super easy. I marinated a top sirloin overnight and threw it on the charcoal grill. Cooked it med rare. After serving it to guests with corn on the cob and grilled a...