Balsamic Marinated Flank Steak

Why You’ll Love This Marinated Flank Steak Recipe

When we first started dating, my now-husband would invite me over so he could show off his grilling skills. And his beef cut of choice was flank steak. It’s still often our go-to for a quick grilled dinner. Many time we simple season with salt and pepper, because that’s all it needs when he grills it to perfection. Flank steak is such a wonderful and versatile piece of meat it’s hard to go wrong

But when you add a simple five-ingredient marinade, it infuses even more incredible flavor. You’ll love throwing it on the grill to enjoy al fresco. Here are a few selling points for this grilled flank steak recipe:

• Affordable. A minimal ingredients list plus a piece of flank steak, which is one of the more affordable cuts of meat available, will have you making this recipe often.
• Easy. I love using marinades for meat and vegetables because they are such a great time-saving hack to add loads of flavor without my needing to put in a ton of effort.
• Naturally Gluten Free. All of the components in this grilled flank steak recipe are naturally gluten free, making it a perfect choice to serve to the whole family, especially if not everyone needs to eat gluten free (but they’d never know it’s gluten free!).

What You’ll Need

You’ll need just six ingredients plus salt and pepper to make this juicy steak. Check the recipe card at the end of this post for the full ingredient amounts.

• Flank Steak: Otherwise labeled as London Broil, flank steak is a lean cut of beef that is great for the grill. You’ll need about 1.5-2.5 pounds of meat depending on your appetites.
• Balsamic Vinegar: There’s no substitute for balsamic vinegar in this marinade, although in a pinch you could use red wine vinegar.
• Sun-Dried Tomatoes: Use sun-dried tomatoes that are packed in oil (you’ll also use the oil).
• Oil: Use oil from the sun-dried tomatoes or you can use extra virgin olive oil.
• Rosemary: I prefer fresh rosemary but you can substitute ½ teaspoon of dried rosemary.
• Garlic: Add more garlic for extra flavor.
• Salt and Pepper: Coarse salt and freshly ground pepper season the meat.

How To Grill Flank Steak

This easy grilling recipe will have you relying on it all summer long. See how to make grilled flank steak in the photos below. Find the detailed instructions in the recipe card lower down.

• Make marinade. Combine balsamic vinegar, tomatoes, oil, rosemary, and garlic in a plastic bag.
• Add the steak. Place the steak in the bag.

• Marinate. Let and let the steak marinate, then heat your grill.
• Season. Remove the steak from the marinade and season it with salt and pepper.

• Grill. Grill the steak on one side.
• Flip. Then flip the steak over and grill until your desired level of doneness.

Flank Steak Grill Times

Here’s a look at the guidelines for cooking grilled flank steak to your desired doneness:

• Rare – For rare steak, grill it for about 4 minutes on each side until the internal temperature when using a meat thermometer reaches 120° F–125° F.
• Medium Rare – Grill the steak for 5-6 minutes on each side. The thermometer should read 130° F when the steak is done.
• Medium Well – For a medium well-done steak, you’ll want to cook it a bit longer, at 7-10 minutes per side. The correct temperature for a medium well steak is 145° F–155° F.
• Well Done – A well done steak will be cooked for the longest amount of time, for at least 10 minutes per side. The thermometer should read 155° F or above for a well done steak.

How Long Should You Marinate Flank Steak?

When it comes to marinating cuts of beef like flank steak, you’ll want to program in a long marinating time, preferably for at least 12 hours and overnight is even better. But, if you don’t have time to plan that far ahead, try to get at least an hour of marinating time. The longer the steak marinates the better the fibers in the meat will break down and relax, which results in a more tender bite after the meat is grilled.

How To Store Grilled Flank Steak

Save your leftover grilled steak for another meal (tip: it’s great in my Grilled Steak Mango Salad recipe!). Here’s how to store it:

• Fridge – Cool the steak and place it in an airtight container in the fridge for up to 2 days.
• To Reheat – Warm the steak on the stove in a skillet over medium heat, or heat it in the microwave, covered, until hot.

Make It A Meal

Make this grilled flank steak the centerpiece of a classic steak dinner with a side of baked potatoes and Creamed Spinach, and if you have leftovers save them to make a salad! Here are a few more serving suggestions:

• Potatoes. Steak and potatoes were made for each other! I have so many options – try a side of Cheesy Scalloped Potatoes, savory Air Fryer Ranch Potatoes, or classic and creamy Instant Pot Mashed Potatoes.
• Vegetables. Keep the flavors of the main dish going with a side of Balsamic Glazed Green Beans. Other nice choices for steak include Summer Sauteed Vegetables, as well as simply Roasted Asparagus or super flavorful Garlic Butter Asparagus.
• Salad. Keep it ultra simple and make a salad to go with this flavorful grilled flank steak. My Easy Greek Salad is a favorite, or make Caprese Zoodles Salad to make the most of summer squash season.
• Bread. A side of gluten-free bread or rolls is always welcome with bites of savory steak. Serve a big bowl of Gluten Free Garlic Breadsticks, Gluten Free Crescent Rolls, or Gluten Free Garlic Dinner Rolls with marinated flank steak.

More Beef Recipes To Try

• Caprese Filet Mignon Steak
• Beefaroni
• Philly Cheesesteak Sloppy Joes