How to Cook London Broil on the Grill: A Comprehensive Guide

Are you looking for a delicious and easy-to-make dish for your next barbecue? London broil is a great option that will surely impress your guests. This flavorful cut of beef is perfect for grilling, and with the right technique, you can create a mouth-watering dish that everyone will love. In this article, we will show you how to cook London broil on the grill step by step, including all the tips and tricks to make it perfect every time.

What is London Broil?

Before we begin, let’s first understand what London broil is. Contrary to popular belief, London broil is not a specific cut of beef, but a cooking method. A London broil is typically made from flank steak or top round steak that is marinated, grilled, and then thinly sliced against the grain.


– 2 pounds of flank steak or top round steak
– 1/2 cup soy sauce
– 1/4 cup Worcestershire sauce
– 1/4 cup olive oil
– 2 tablespoons red wine vinegar
– 2 teaspoons Dijon mustard
– 1 teaspoon onion powder
– 1 teaspoon garlic powder
– 1/2 teaspoon black pepper

Marinating the Steak:

The key to a succulent London broil is marination. You should marinate the steak for a minimum of 2 hours, or ideally overnight, to allow the flavors to permeate the meat properly.

To marinate the steak, whisk together soy sauce, Worcestershire sauce, olive oil, red wine vinegar, Dijon mustard, onion powder, garlic powder, and black pepper in a large bowl. Place the steak in a large resealable plastic bag, pour the marinade over it, and let it marinate in the refrigerator.

Preparing the Grill:

While the steak is marinating, prepare your grill. Heat the grill to medium-high heat, about 375-450°F. Make sure to clean the grates thoroughly, and lightly coat them with oil to prevent the steak from sticking.

Grilling the Steak:

Once the steak has finished marinating, remove it from the bag and discard the marinade. Pat the steak dry with a paper towel and allow it to come to room temperature, about 20 minutes.

Place the steak on the grill, close the lid, and let it cook for 5-6 minutes on each side for medium-rare, or 6-7 minutes for medium doneness. Use a meat thermometer to check the internal temperature of the steak, and remove it from the grill when it reaches 125°F for medium-rare, or 135°F for medium doneness.

Resting the Steak:

Once the steak is off the grill, let it rest for at least 5 minutes before slicing. This allows the juices to redistribute throughout the meat, ensuring a moist and flavorful steak. Cut the steak against the grain into thin slices, and serve with your favorite sides.

Tips and Tricks:

– Pat the steak dry with a paper towel before grilling to ensure a good sear.
– Do not overcook the steak, as it will become tough and chewy. Always check the internal temperature with a meat thermometer.
– Let the steak rest before slicing to ensure juicy and tender meat.
– Make sure to cut the steak against the grain to ensure a tender bite.

Frequently Asked Questions:

Can I use a gas or charcoal grill to cook London broil?

Yes, you can use either a gas or charcoal grill to cook your London broil. The key is to heat the grill to the right temperature and make sure the grates are clean and oiled.

What is the best way to slice the steak?

The steak should be cut against the grain, which means slicing perpendicular to the direction of the muscle fibers. This ensures a tender bite and prevents the meat from being stringy.

How long should I marinate the steak?

The steak should be marinated for at least 2 hours, or preferably overnight, to allow the flavors to penetrate the meat.

What sides go best with London broil?

Some delicious sides that pair well with London broil include roasted vegetables, mashed potatoes, grilled corn, or a simple green salad.