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Grilled London Broil

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Grilled London broil is marinated in flavorful ingredients, then grilled to perfection. The best part is that you can begin the marinating process in the morning and have it grilled and on the table for dinner in under 30 minutes.

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We love grilled London Broil. It’s so easy! Make up the marinade, place the steak in an airtight container (zip top bag or container with lid), pour it over the top, seal it up, and store it in the refrigerator for 8-12 hours. The acids in the marinade will help tenderize tougher beef steaks and add amazing flavor! Grill this London broil over high-heat, then slice against the grain and serve! And you’ll have great results every time.

Raw Flank Steak

What is London broil?

London broil is a style of cooking rather than a cut of meat. Tough beef steaks are seasoned or marinated in garlic, soy sauce and brown sugar, then broiled. Marinating is preferred as it helps increase tenderness. London broil is synonymous with flank steak though top round or skirt steak are also used. Despite its name, London broil is a North American cooking technique, also referred to as the “Dawson.”

sliced-london-broil

London Broil Recipe Ingredients:

  • Flank Steak: About 2 1/2 pounds (sub with top round steak or skirt steak). Each of these steaks are easy to find at your local grocery store. The thing to keep in mind about flank steak is that it’s a cross between a roast and steak in width and density. So a longer marinating time is recommended. However, we don’t recommend marinating longer than 24 hours. We’ve found that 8-12 hours does the trick! It is important to let the marinated steak sit at room temperature for at least 30 minutes before grilling.
  • Pineapple-rum and ginger steak marinade: This mixture is made with pineapple juice, dark rum, soy sauce, garlic, and other wonderful ingredients. What we love about this marinade is that it gives the meat a delicious umami flavor with a slight hint of sweetness. The pineapple helps tenderize the flank steak, and the rest of the ingredients bring out the rich beefiness of the meat. You can also try grilled London broil with one of our other fantastic marinade recipes.
  • A reliable meat thermometer!
marinated  Flank Steak on the grill

Cooking Method

  • Combine marinade according to the recipe instructions.
  • Place flank steak into a resealable plastic bag, pour marinade over the top and work it around the meat for an even coating. Seal the bag and place it in the refrigerator for 8-12 hours.
  • Prepare your grill for high-heat cooking. 
  • Remove the steak from the marinade
  • Place it onto the grill, close the lid and cook for 5-7 minutes; turn the steak over and cook for an additional 5 minutes. Cook time is entirely based on your desired doneness. We recommend medium-rare to medium doneness for this recipe (an internal temperature of 135-140 degrees F). For more information, please read my steak temperature guide.
  • Once cooked to your liking, remove the grilled London broil from the heat and place it on to a clean cutting board.
  • Let the meat rest for at least 10 minutes before carving it against the grain. Place onto a large platter or serving dish and enjoy!
  • Store leftovers in an airtight container in the refrigerator for up to 3-4 days. Reheat in the microwave or in a skillet on the stove top.
Marinated and Grilled London Broil sliced on cutting board

Tips:

  • Expecting a large group for dinner? Double or triple this grilled London broil recipe to make enough for everyone!
  • Lightly score the flank steak with a sharp knife or piece with a jacquard to allow the marinade to permeate the meat and shorten cooking time.
  • You can substitute the flank steak with skirt steak or top round. Skirt steak tends to be thinner cut of beef than flank, so keep this in mind when grilling, and adjust your cooking time as needed.
  • Keep in mind that beef needs salt to bring out its natural flavor. Ingredients like soy sauce can help add the needed sodium, and provide extra flavor.

What to serve with London broil

Try some of our other amazing steak recipes!

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Grilled London Broil

Grilled London broil is marinated in flavorful ingredients, then grilled to perfection. The best part is that you can begin the marinating process in the morning and have it grilled and on the table for dinner in under 30 minutes.
5 from 2 votes
Print Pin Rate
Course: Main Course
Cuisine: American BBQ, Fusion, Latin American
Keyword: Grilled flank steak, Grilled flat steak, steak tacos
Prep Time: 25 minutes
Cook Time: 12 minutes
Marinating Time: 12 hours
Total Time: 12 hours 37 minutes
Servings: 6 Servings
Calories: 338kcal
Author: Sabrina Baksh

Ingredients

Instructions

  • Combine the pineapple-rum and ginger marinade according to the recipe instructions.
  • Place flank steak into a resealable plastic bag, pour marinade over the top and work it around the meat for an even coating. Seal the bag and place it in the refrigerator for 8-12 hours.
  • Prepare your grill for high-heat cooking.
  • Remove the steak from the marinade, place it onto the grill, close the lid and cook for 5-7 minutes; turn the steak over and cook for an additional 5 minutes. Cook time is entirely based on your desired doneness. We recommend medium-rare to medium doneness for this recipe (an internal temperature of 135-140 degrees F). For more information, please read my steak doneness guide.
  • Once cooked to your liking, remove the steak from the grill and place it on a clean cutting board. Let the meat rest for at least 10 minutes before carving it against the grain. Serve and enjoy!

Notes

Expecting a large group for dinner? Double or triple this grilled London broil recipe to make enough for everyone!
Tip: Lightly score the flank steak or use a jacquard to help the marinade permeate the meat and shorten cooking time.
You can substitute the flank steak with skirt steak or top round. Skirt steak tends to be thinner than flank, so keep this in mind when grilling, and adjust your cooking time as needed.

Nutrition

Calories: 338kcal | Carbohydrates: 6g | Protein: 42g | Fat: 15g | Saturated Fat: 5g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 7g | Cholesterol: 113mg | Sodium: 511mg | Potassium: 823mg | Fiber: 2g | Sugar: 1g | Vitamin A: 2121IU | Vitamin C: 2mg | Calcium: 55mg | Iron: 4mg
Derrick Riches
Derrick Riches

I began writing about Barbecue & Grilling in 1997 with one mission, to help the backyard chef have the best experience possible.

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