Best Grilled London Broil Recipe: Smoky Char With Bold Garlic Finish

This London broil recipe delivers the best smoky char and bold garlic finish every time. The secret is a simple marinade and precise grilling technique.

You’ll achieve perfectly cooked meat with deep flavor and a crust that cracks with each slice. This method transforms an affordable cut into a restaurant-quality dish.

Ingredients for Best Grilled London Broil

Transform an affordable cut with these premium ingredients for bold, charred flavor.

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The steak is non-negotiable—London broil specifically refers to top round or flank cut, about 1-inch thick. Whole Foods or Costco carry excellent pre-trimmed options. Look for vibrant red color with visible marbling; avoid anything with a grayish tint. The olive oil should be high-quality extra-virgin—this is where flavor builds, so don’t skimp on a cheap bottle.

No fresh herbs? Dried at one-third the amount works, but fresh delivers the bright, aromatic finish this dish deserves. Out of balsamic? Red wine vinegar plus 1 tsp brown sugar mimics the tangy sweetness. For soy sauce, tamari offers a gluten-free alternative. The Worcestershire can be swapped for more soy sauce with a dash of fish-free Worcestershire.

Marinate the steak 2-12 hours for optimal flavor penetration. Cooked steak keeps 3-4 days refrigerated, or freeze for 3 months. Slice against the grain just before serving for maximum tenderness.

Step-by-Step Instructions for Grilled London Broil

Master these techniques for perfectly charred meat with deep, complex marinade flavors.

Step 1: Create the Garlic-Herb Marinade

In a medium bowl, whisk together the 0.5 cup Extra-Virgin Olive Oil, 0.25 cup Balsamic Vinegar, 2 tbsp Worcestershire Sauce, and 2 tbsp Soy Sauce until fully emulsified. The vinegar and soy sauce will create that signature tangy-savory balance.

Add the 6 cloves Garlic Cloves (finely minced), 2 tbsp Fresh Rosemary, 2 tbsp Fresh Thyme, 1 tbsp Dijon Mustard, 1.5 tsp Kosher Salt, 1 tsp Freshly Ground Black Pepper, 0.5 tsp Red Pepper Flakes, and 1 tbsp Brown Sugar. Stir vigorously for 1 minute until the brown sugar fully dissolves and the herbs are evenly distributed throughout the mixture.

Step 2: Marinate the London Broil

Place the 2 lb London Broil Steak in a resealable plastic bag or shallow dish. Pour the marinade over the steak, ensuring all surfaces are coated. Massage the marinade into the meat for 30 seconds to ensure penetration into the muscle fibers.

Seal and refrigerate for at least 4 hours, but ideally overnight. This extended marinating time allows the acidic components in the balsamic vinegar and Worcestershire sauce to tenderize the meat while the garlic and herbs infuse every bite. Flip the steak halfway through marinating for even flavor distribution.

Step 3: Grill to Medium-Rare Perfection

Remove the steak from the refrigerator 30 minutes before grilling to bring it to room temperature. Preheat your grill to high heat and clean the grates thoroughly. Just before grilling, shake off excess marinade but don’t rinse—the residual marinade will create beautiful caramelization.

Place the steak on the grill and cook for 4-5 minutes per side for medium-rare, or until the internal temperature reaches 135°F. Look for deep grill marks and a slight char on the edges. Avoid pressing the steak with tongs—this squeezes out precious juices. Rotate the steak 90 degrees after 2 minutes on each side for professional crosshatch grill marks.

Step 4: Rest and Slice Against the Grain

Transfer the steak to a cutting board and tent loosely with foil. Let it rest for 10 minutes—this allows the muscle fibers to relax and the juices to redistribute. The internal temperature will rise to 145°F during this rest, achieving perfect medium-rare doneness.

Locate the grain direction (you’ll see the long muscle fibers) and slice perpendicular to it into ¼-inch thick slices. Cutting against the grain shortens the muscle fibers, ensuring each bite is tender. Serve immediately while the steak is still warm, with the accumulated juices spooned over the top for maximum flavor impact.

Creative Variations of This best grilled london broil

Asian-Inspired Twist

Swap the balsamic for 0.25 cup rice vinegar and add 1 tbsp grated ginger and 2 tbsp honey to the marinade. This creates a sweet-savory profile perfect for serving with steamed jasmine rice. I forage wild ginger near coastal trails for extra depth. 🌿

Coffee Rub Version

Replace the fresh herbs with 2 tbsp finely ground coffee and 1 tbsp smoked paprika in the marinade. The coffee enhances the char while adding earthy complexity. Let it marinate for exactly 6 hours to avoid bitterness.

Mediterranean Style

Add zest of 1 lemon and 1 tsp dried oregano to the marinade. Serve with a Greek salad and warm pita. The citrus brightens the rich beef flavors beautifully. I pick wild oregano along my motorcycle routes.

Spicy Chipotle Kick

Stir in 1 tbsp adobo sauce from canned chipotles and 1 tsp ground cumin. This adds smoky heat that pairs perfectly with grilled corn. Adjust the red pepper flakes to 1 tsp for extra fire. 🔥

Bourbon Glazed

Mix 2 tbsp bourbon and 1 tbsp maple syrup into the marinade. Baste the steak with extra glaze during the last 2 minutes of grilling. The sugar caramelizes into a glossy, sticky finish.

Herb-Crusted

Press a mix of ½ cup panko and 2 tbsp chopped parsley onto the steak before grilling. This creates a crispy crust that contrasts with the tender meat. Use a meat mallet to help the crust adhere.