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London broil is a classic and versatile dish that’s beloved by grilling enthusiasts for its bold flavors and tender texture when prepared correctly. This article will guide you through everything you need to know about how long to grill London broil, from preparation to serving, ensuring a mouthwatering result every time.
Understanding London Broil
What is London Broil?
Contrary to its name, London broil is not a specific cut of meat but rather a preparation style. It often refers to lean cuts like flank steak or top round. These cuts are known for their bold, beefy flavor but can be tough if not handled properly. That’s why marinating and careful cooking techniques are essential for making this dish shine.
Marinating for Success
Marinating is a critical step when preparing London broil. A good marinade not only infuses the meat with flavor but also tenderizes it. A simple and effective marinade might include:
- Soy sauce for saltiness.
- Olive oil for moisture.
- Garlic and herbs for aroma.
- Vinegar or citrus juice for acidity.
Let the meat marinate for at least 4 hours, but for the best results, aim for 12-24 hours. The longer the marination, the more tender and flavorful the meat will be.

Ingredients
To prepare a delicious London broil, you’ll need the following ingredients:
- 1.5-2 pounds of flank steak or top round (commonly used for London broil)
- 1/4 cup soy sauce
- 1/4 cup olive oil
- 3 cloves garlic, minced
- 2 tablespoons balsamic vinegar or lemon juice
- 1 tablespoon Worcestershire sauce
- 1 tablespoon honey or brown sugar (optional, for a hint of sweetness)
- 1 teaspoon black pepper
- 1 teaspoon salt
- 1 teaspoon dried oregano or thyme
- 1/2 teaspoon smoked paprika (optional, for added depth)
Preparing the Grill
Choosing the Right Grill
London broil can be grilled on any type of grill, but the method you choose can slightly affect the flavor:
- Gas grills offer convenience and consistent heat.
- Charcoal grills add a smoky flavor that complements the meat’s robust profile.
- Pellet grills combine ease of use with subtle smoky undertones.
Preheating the Grill
Preheating is essential for achieving a good sear on the meat. Set your grill to high heat (around 450°F) and let it preheat for 10-15 minutes. This ensures the grates are hot enough to lock in juices and create those coveted grill marks.
Oiling the Grates
To prevent the meat from sticking, lightly oil the grates using a paper towel dipped in oil and tongs. This step also makes cleanup easier.
Grilling Times for London Broil
Key Factors Affecting Grill Time
The grilling time for London broil depends on several factors:
- Thickness of the cut (most are around 1-1.5 inches).
- Grill temperature.
- Desired level of doneness.
General Grilling Guidelines
For a 1-1.5 inch thick London broil:
- Rare (125°F internal temperature): Grill for 5-6 minutes per side.
- Medium-rare (135°F): Grill for 6-7 minutes per side.
- Medium (145°F): Grill for 7-8 minutes per side.
- Well-done (160°F+): Grill for 9-10 minutes per side.

Using a Meat Thermometer
A meat thermometer is your best friend when grilling London broil. Insert it into the thickest part of the meat to get an accurate reading. Once the desired temperature is reached, remove the meat from the grill and let it rest for 5-10 minutes. This resting period allows the juices to redistribute, making the meat juicier.
Tips for Perfect London Broil
- Sear for Flavor: Start with high heat to sear the outside, then reduce the temperature slightly to finish cooking.
- Avoid Overcooking: London broil is lean, so overcooking can result in a dry, chewy texture.
- Let It Rest: Always rest the meat before slicing to preserve its juices.
- Slice Against the Grain: To maximize tenderness, slice the meat thinly and against the grain.
Serving Suggestions
Pairing Ideas
London broil pairs beautifully with a variety of sides and sauces:
- Sides: Roasted vegetables, mashed potatoes, or a crisp green salad.
- Sauces: Chimichurri, garlic butter, or a balsamic glaze enhance its flavor profile.
Presentation Tips
Slice the meat thinly and arrange it on a platter for an elegant presentation. Garnish with fresh herbs like parsley or cilantro for a pop of color.
Conclusion
Grilling London broil to perfection doesn’t have to be complicated. By marinating the meat, preheating your grill, monitoring cooking times, and using a meat thermometer, you can achieve a tender, flavorful result that will impress family and friends. Don’t forget to experiment with marinades and side dishes to make the dish your own.
Ready to give it a try? Share your favorite London broil grilling tips and experiences in the comments below.