London Broil Roast Recipe Oven: Marinated and Sliced for Maximum Flavor

This oven-roasted London broil delivers tender, flavor-packed slices with minimal effort. I developed this method after years of testing in my small Boston kitchen, perfecting the balance between a bold marinade and precise roasting.

The key is marinated beef cooked at high heat to lock in juices, then sliced thinly against the grain. This transforms an affordable cut into a restaurant-quality main course that never disappoints.

You’ll get a perfectly crusted exterior with a juicy, pink center—every bite packed with savory, garlicky depth. The oven does most of the work, leaving you free to prep sides.

Ideal for Sunday dinners or impressive weeknight meals. This technique guarantees consistent results, even in a cramped kitchen.

Ingredients for London Broil Roast Recipe Oven

Transform affordable beef into restaurant-quality dinner with these bold, simple ingredients.

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The beef is everything here. London broil (top round) needs to be about 1-inch thick for even cooking—ask the butcher to cut it if the package looks too thin. Whole Foods and Costco have great pre-cut options. Look for vibrant red color with minimal fat marbling. Don’t skip the marinating time; overnight is ideal but 4 hours minimum works in a pinch.

No Worcestershire? Extra soy sauce plus a dash of fish sauce (if you have it) gets close. Apple cider vinegar can sub for balsamic in a 1:1 ratio. Dried herbs not your thing? Use fresh rosemary and thyme at triple the amount, finely chopped. The Dijon mustard is key for that crust—don’t swap in yellow mustard, it’s too mild.

Marinated steak keeps in the fridge for 24 hours before cooking. Leftovers? Slice and store in airtight containers for 3-4 days—great for sandwiches or salads. Freezes beautifully for up to 3 months if you need to prep ahead.

Step-by-Step Instructions for London Broil Roast Oven

Here’s the foolproof method I use every time for tender, flavorful results that impress.

Step 1: Create the Flavor-Packed Marinade

In a large resealable bag, combine 0.5 cup Extra-Virgin Olive Oil, 0.33 cup Soy Sauce, 0.25 cup Balsamic Vinegar, 6 cloves minced Garlic Cloves, 2 tbsp Worcestershire Sauce, 2 tbsp Dijon Mustard, 2 tsp Dried Rosemary, 2 tsp Dried Thyme, 2 tsp Black Pepper, 2 tsp Kosher Salt, and 1 tsp Red Pepper Flakes.

I crush the dried herbs between my fingers as I add them to release their aromatic oils. Seal the bag and squish everything together with your hands for 30 seconds to fully incorporate. The marinade should look emulsified with tiny herb specks throughout.

This combination delivers deep umami from the soy and Worcestershire, brightness from the vinegar, and warmth from the mustard and spices. It’s the foundation of all that flavor in your final dish.

Step 2: Marinate the London Broil Steak

Add the 2 lb London Broil Steak to the marinade bag, ensuring it’s fully submerged. I like to massage the marinade into the meat for 1 minute to ensure every surface is coated. Seal the bag, removing as much air as possible before refrigerating.

Marinate for at least 4 hours, but I prefer overnight for maximum flavor penetration. The marinade will transform the steak from tough to tender while infusing it with complex flavors. Turn the bag over halfway through if possible to ensure even marinating.

Real talk: Don’t rush this step. The longer the steak marinates, the more those bold flavors develop and the more tender your final result will be.

Step 3: Roast in the Oven to Perfection

Preheat your oven to 400°F. Remove the London Broil Steak from the marinade (reserve the marinade) and pat it very dry with paper towels. This step is crucial for achieving a good sear on the surface.

Place the steak on a wire rack set over a baking sheet. Roast for 20-25 minutes for medium-rare, or until an instant-read thermometer inserted into the thickest part registers 135°F for medium-rare or 145°F for medium.

The steak should develop a beautiful dark crust on the outside while remaining juicy inside. If you want to create an even deeper crust, you can sear it in a hot skillet for 2 minutes per side after roasting.

Step 4: Rest and Slice Against the Grain

Transfer the roasted London Broil Steak to a cutting board and let it rest for 10-15 minutes. This resting period allows the juices to redistribute throughout the meat, ensuring each slice is moist and flavorful.

Locate the grain direction (you’ll see lines running through the meat). Using a sharp knife, slice against the grain into ¼-inch thick slices. Slicing against the grain shortens the muscle fibers, resulting in a more tender bite.

Arrange the slices on a serving platter and sprinkle with 0.25 cup Fresh Parsley for a fresh finish. The meat should be beautifully browned on the outside with a slightly pink center for medium-rare.

Common Mistakes When Making Great london broil roast recipe oven

Skipping the Marinating Time

I intentionally tested this recipe with 30-minute marinating to see what would happen. The result was tough, bland meat. The 4-hour minimum is crucial for breaking down fibers and infusing flavor. Trust me, overnight marinating transforms this into a tender masterpiece. 💪

Not Patting Dry

After removing from the marinade, you must pat the steak very dry with paper towels. Skipping this step creates steam in the oven, preventing that beautiful crust from forming. I use 3-4 paper towels for the job.

Wrong Oven Temperature

400°F is the sweet spot for this cut. Any lower and you’ll get gray, dry meat. Higher temperatures can burn the exterior before the center cooks. My Boston apartment oven runs hot, so I actually set it to 385°F.

Slicing With the Grain

This is the most common mistake I see. Slicing against the grain is non-negotiable for tenderness. Look for the muscle fibers running through the meat and cut perpendicular to them. Use a sharp 8-inch chef’s knife.

Skipping the Rest

Those juices need time to redistribute. Cutting too soon sends them all over your cutting board. I rest mine for the full 15 minutes, tented with foil. The meat will carryover cook slightly during this time. 🔥

Overcrowding the Pan

Use a wire rack over a baking sheet for proper air circulation. Without it, the bottom will steam instead of roast. I use a half-sheet pan with a cooling rack from my local Boston market.

Frequently Asked Questions