London Broil typically cooks quickly, requiring 10-20 minutes total for medium-rare to medium doneness, depending on thickness and cooking method.
Crafting a tender, flavorful London Broil is a truly rewarding kitchen experience. This approach to cooking beef, often associated with flank or top round steak, transforms a tougher cut into a succulent centerpiece with the right preparation and precise timing.
Understanding London Broil: More Than Just a Cut
London Broil refers to a cooking method, not a specific cut of beef, though it’s most commonly applied to lean, muscular cuts like flank steak or top round. The method involves high-heat cooking followed by thin slicing against the grain. Its popularity stems from its ability to deliver a robust beef flavor and a satisfying chew when prepared correctly.
Common Cuts Used
Flank steak is a popular choice for London Broil due to its strong beefy flavor and relatively thin profile, which allows for quick cooking. Top round steak, a thicker cut from the hindquarter, also works well but benefits from slightly longer cooking times and often a more aggressive marinade to tenderize its denser muscle fibers.
Why Marinade is Key
Given the inherent toughness of these cuts, a marinade is not just for flavor; it’s a vital tenderizing step. Acidic components like vinegar, citrus juice, or wine begin to break down muscle fibers, while enzymes in ingredients like pineapple or papaya can further tenderize. Salt helps muscle fibers retain moisture, ensuring a juicy result. A good marinade also infuses deep flavor, complementing the beef’s natural richness.
Prep Time: Laying the Foundation for Flavor
Proper preparation before cooking makes a significant difference in the final texture and taste of your London Broil. Skipping these steps can lead to a less enjoyable outcome.
Marinading is the most time-intensive part of the preparation. For flank steak, a minimum of 2 hours is advisable, but 4-6 hours yields better results. For thicker top round, aim for 6-12 hours, or even overnight, to allow the marinade to penetrate and tenderize effectively. Avoid excessively long marinades (over 24 hours) with highly acidic components, as they can sometimes make the meat mushy.
Before cooking, remove the marinated steak from the refrigerator and let it sit at room temperature for 30-60 minutes. This step promotes more even cooking, preventing the exterior from overcooking while the interior remains cold. Pat the steak dry with paper towels just before cooking; a dry surface ensures a better sear and crust.
How Long London Broil? The Core Cooking Times
The cooking duration for London Broil depends on the cut’s thickness, the heat source, and your desired level of doneness. High, direct heat is essential to achieve a good sear quickly, locking in juices.
Grilling Times for Flank Steak
For a flank steak, typically 1 to 1.5 inches thick, grilling is a fantastic option. Preheat your grill to high heat (450-500°F / 232-260°C). Cook for 4-7 minutes per side for medium-rare (130-135°F / 54-57°C internal temperature) or 6-9 minutes per side for medium (135-140°F / 57-60°C). Use a meat thermometer to confirm doneness, as visual cues alone can be misleading.
Broiling Times for Top Round
Broiling in an oven is another excellent high-heat method. Position your oven rack 4-6 inches from the broiler element and preheat the broiler for at least 10 minutes. For a top round steak, often 1.5 to 2 inches thick, broil for 6-10 minutes per side for medium-rare, or 8-12 minutes per side for medium. Again, internal temperature is the most reliable indicator.
Oven Roasting (Less Common, but an Option)
While less traditional for London Broil, oven roasting can work for thicker cuts if you prefer a more even cook without a char. Sear the steak on all sides in an oven-safe skillet on the stovetop, then transfer the skillet to a preheated oven at 375°F (190°C). Roast for 15-25 minutes, checking internal temperature frequently. This method generally results in a less pronounced crust.
Achieving Perfect Doneness: Internal Temperature is Your Guide
Relying on a reliable instant-read meat thermometer is the single most important tool for cooking London Broil perfectly. Visual cues like color or firmness are subjective and can lead to overcooked, tough meat. The target temperature is taken from the thickest part of the steak, avoiding bone or gristle.
Remember that the steak’s internal temperature will continue to rise by 5-10°F (3-6°C) during the resting period after it’s removed from the heat. This is carryover cooking, and it’s essential to factor it into your target temperatures. For food safety, the USDA advises cooking whole cuts of beef to a minimum internal temperature of 145°F (63°C), followed by a three-minute rest.
| Doneness | Internal Temperature | Texture Notes |
|---|---|---|
| Rare | 125-130°F (52-54°C) | Cool red center, soft |
| Medium-Rare | 130-135°F (54-57°C) | Warm red center, tender |
| Medium | 135-140°F (57-60°C) | Pink center, juicy |
| Medium-Well | 140-145°F (60-63°C) | Slightly pink center, firmer |
| Well-Done | 145-150°F (63-66°C) | Little to no pink, firm (not recommended) |
Once your London Broil reaches its target temperature, remove it from the heat and transfer it to a cutting board. Cover it loosely with foil and let it rest for at least 5-10 minutes. This resting period allows the muscle fibers to relax and reabsorb juices, resulting in a significantly more tender and moist steak. Cutting too soon will cause the juices to run out, leaving you with dry meat.
Slicing and Serving: The Final Touch
Slicing London Broil correctly is as important as cooking it properly. Because flank and top round steaks have long, visible muscle fibers, slicing against the grain is crucial for tenderness. Slicing with the grain will result in long, chewy strands of meat.
Identify the direction of the muscle fibers running through the steak. Using a sharp knife, slice perpendicular to these fibers at a slight angle. This shortens the fibers, making each bite more tender. Aim for thin slices, about 1/4 inch thick, for the best texture. Serve immediately with your favorite sides.
| Base Flavor | Key Ingredients | Flavor Characteristics |
|---|---|---|
| Savory & Umami | Soy sauce, Worcestershire, garlic, ginger | Deep, rich, earthy |
| Acidic & Bright | Red wine vinegar, lemon juice, Dijon mustard | Tangy, cuts richness, tenderizing |
| Sweet & Spicy | Brown sugar, honey, chili flakes, sriracha | Balanced sweetness with a kick |
Storing Leftovers Safely
Proper storage ensures your delicious London Broil remains safe and flavorful for future meals. Once cooled, transfer any leftover steak to an airtight container. Refrigerate it promptly within two hours of cooking.
Leftover London Broil will keep well in the refrigerator for 3-4 days. For longer storage, you can freeze it. Wrap individual slices or smaller portions tightly in plastic wrap, then place them in a freezer-safe bag or container. Frozen London Broil maintains quality for 2-3 months. Thaw frozen steak in the refrigerator overnight before reheating.
When reheating, use gentle methods to avoid drying out the meat. Slices can be quickly warmed in a skillet with a splash of broth, or briefly microwaved on a low setting. Avoid high heat, which can make the steak tough.
Troubleshooting Common London Broil Issues
Even experienced cooks encounter challenges. Understanding common issues helps you adjust and improve your technique.
Toughness: The most frequent complaint with London Broil. This usually stems from insufficient marinating time, overcooking, or slicing with the grain. Ensure you marinate for several hours, cook to the correct internal temperature, and always slice against the grain. If the steak feels tough, try slicing it even thinner.
Dryness: Overcooking is the primary cause of dry London Broil. Using a meat thermometer and resting the steak are crucial for retaining moisture. A good marinade also contributes to juiciness. If your steak turns out dry, consider using it in dishes where moisture can be added, such as sandwiches with gravy or stir-fries.
Uneven Cooking: This can occur if the steak is not brought to room temperature before cooking, or if your grill or broiler has hot spots. Ensure even heat distribution and rotate the steak if necessary. For very thick cuts, a brief initial sear followed by lower-heat roasting can promote more uniform cooking.
Lack of Flavor: A weak or short marinade can result in bland steak. Ensure your marinade has robust flavors and sufficient time to penetrate the meat. Also, patting the steak dry before searing helps develop a flavorful crust.
References & Sources
- U.S. Department of Agriculture. “fsis.usda.gov” The USDA provides comprehensive food safety guidelines, including recommended internal cooking temperatures for various meats.
