I’ve discovered the secret to turning tough flank steak into a mouthwatering London Broil that practically melts in your mouth. It’s all about the diamond-cut pattern, which not only tenderizes the meat but creates perfect pockets for that garlicky, lemony marinade to work its magic. The result? A juicy, flavorful steak that cooks in just 10 minutes under the broiler. And those caramelized onions on top? Trust me, they’re about to change your weeknight dinner game forever.
Why You’ll Love this London Broil
When it comes to weeknight meals that impress without the stress, this London Broil recipe tops my list of go-to dishes. The diamond-cut pattern isn’t just for show—it helps tenderize the meat and allows those garlicky, lemony flavors to penetrate deeply.
You’ll love how the butter-sautéed onions create a sweet contrast to the savory beef. And can we talk about that quick cooking time? Ten minutes under the broiler, and dinner’s ready. The thin-sliced technique, cutting against the grain, transforms what could be a tough cut into something melt-in-your-mouth tender. Perfect for busy nights when you crave something special.
What Ingredients are in London Broil?
London Broil is a classic dish that’s all about transforming a relatively inexpensive cut of meat into something truly special. The magic happens through proper marinating and cooking techniques, which help tenderize the flank steak while infusing it with savory flavors. For this juicy recipe, you’ll need a handful of simple ingredients that work together to create something far greater than the sum of their parts.
- 1 lb beef flank steak (best quality you can find)
- 2 medium onions, thinly sliced
- 1 tablespoon butter
- 2 tablespoons oil
- 1 teaspoon lemon juice
- 3/4 teaspoon salt (divided: 1/4 for onions, 1/2 for marinade)
- 1/4 teaspoon pepper
- 2 cloves garlic, crushed
When shopping for your flank steak, quality really matters here. Look for meat with good marbling and a rich, deep color. The fat distributed throughout the meat (that’s the marbling) will help keep things juicy during the high-heat broiling process. You might be tempted to substitute other cuts, but flank steak’s unique grain structure is what gives London Broil its characteristic texture and flavor. And don’t skimp on the garlic either—those two crushed cloves provide a backbone of flavor that makes this dish sing.
How to Make this London Broil
Preparing this London Broil starts with a bit of knife work that makes all the difference. Take your 1 lb beef flank steak and score both sides in a diamond pattern, cutting about 1/8 inch deep. This isn’t just for looks—those little cuts allow the marinade to penetrate deeper into the meat, and they help prevent the steak from curling up under the broiler’s intense heat. Think of it as creating tiny flavor pockets throughout your beautiful piece of beef.
While your steak is getting ready for its flavor bath, melt 1 tablespoon of butter in a skillet and add those 2 thinly sliced medium onions with 1/4 teaspoon of salt. Cook them until they’re tender and slightly caramelized, stirring occasionally. There’s something magical about the aroma of onions cooking in butter, isn’t there? Keep this warm while you prepare the meat. Now, mix together 2 tablespoons oil, 1 teaspoon lemon juice, 1/2 teaspoon salt, 1/4 teaspoon pepper, and 2 crushed garlic cloves to create your marinade. Brush half of this flavorful mixture onto one side of the steak.
Position your oven rack so the meat will sit about 3 inches from the heat source, then broil that first side for 5 minutes. The high heat will create a beautiful crust while the inside starts to cook. Flip the steak over (careful, it’s hot!), brush on the remaining marinade, and broil for another 5 minutes. For medium-rare, this timing should be perfect, but you might need to adjust based on the thickness of your steak or your doneness preference. The most essential step comes last—cutting the meat across the grain in thin slices. This breaks up those tough muscle fibers and transforms what could be a chewy experience into tender, juicy bites. Serve those gorgeous slices topped with your warm, buttery onions, and watch as your dining companions fall silent with appreciation.
London Broil Substitutions and Variations
While the traditional recipe delivers incredible results, the beauty of London Broil lies in its flexibility. I can’t help but marvel at how easily it adapts to whatever’s in my kitchen.
Don’t have flank steak? Top round works beautifully, or try sirloin if you’re feeling fancy. The marinade’s a playground too—swap lemon juice for balsamic vinegar, or add soy sauce for umami depth.
Herbs are your friend here. Rosemary, thyme, or oregano can transform the flavor profile. And those onions? Try caramelizing them with mushrooms for a richer topping. Who needs fancy dining when this versatile dish can be reimagined countless ways?
What to Serve with London Broil
Every great London broil deserves equally impressive side dishes to create a meal that’s truly memorable. I love pairing this juicy steak with roasted garlic mashed potatoes or a crisp Caesar salad. The caramelized onions from the recipe already provide amazing flavor, but why stop there?
For a complete dinner, consider adding steamed asparagus drizzled with lemon butter, or perhaps some hearty mushrooms sautéed with thyme. A glass of bold red wine, like Cabernet Sauvignon, brings everything together perfectly. Crusty bread on the side? Always a good call for soaking up those delicious meat juices.
Final Thoughts
After mastering this London broil recipe, I’ve come to appreciate how this affordable cut can transform into something truly spectacular with the right technique. The diamond scoring pattern isn’t just for show—it tenderizes the meat and helps those savory flavors penetrate deeply.
Remember, patience is key here. Those few minutes of resting before slicing against the grain make all the difference between juicy perfection and a tough disappointment. And don’t skip those buttery onions, they’re the unsung heroes.
Can you believe something this impressive is actually weeknight-friendly? Your dinner guests will think you spent hours in the kitchen.
