London broil stays tender in the oven when you marinate it long enough and slice it against the grain every time. If you want to know how to make tender london broil in the oven, the answer is simpler than most people think. It comes down to three things: a good marinade, the right oven temp, and how you cut the meat.
Most folks ruin this cut because they cook it like a steak. London broil is usually top round, which is lean and tough. It needs a little patience and some acid to break down the fibers.
Follow the steps below and you will get a juicy, sliceable roast every single time.
What Cut Of Meat Is London Broil
London broil is not actually a cut of meat. It is a cooking method. Most grocery stores label top round as London broil. Some use flank steak or sirloin tip.
Top round is the most common. It is lean, thick, and has very little fat. That means it dries out fast if you overcook it.
You need to treat it with care. A hot, fast cook will leave you chewing for days. A slow, gentle oven roast with a long marinade is the way to go.
Why The Marinade Matters
The marinade does two jobs. It adds flavor and it helps tenderize the meat.
Acid is the key. Vinegar, lemon juice, or wine breaks down the tough muscle fibers. Oil keeps the meat moist. Salt helps it absorb water.
You want at least 4 hours in the fridge. Overnight is even better. Do not go past 24 hours or the meat gets mushy.
- Use a glass dish or a zip-top bag
- Flip the meat halfway through
- Keep it in the fridge, not on the counter
Ingredients You Will Need
Here is a simple marinade that works every time. You probably have most of these in your kitchen already.
- 1 London broil (about 2 pounds)
- 1/2 cup soy sauce
- 1/4 cup olive oil
- 2 tablespoons red wine vinegar
- 2 tablespoons Worcestershire sauce
- 3 cloves garlic, minced
- 1 teaspoon black pepper
- 1 teaspoon dried thyme
You can swap the vinegar for lemon juice if you prefer. Just keep the acid-to-oil ratio the same.
Tools For The Job
- A shallow baking dish or zip bag
- A meat thermometer (this is not optional)
- A sharp carving knife
- A cutting board with a juice groove
How To Make Tender London Broil In The Oven
Now for the main event. Follow these steps in order and do not skip the resting time.
- Whisk all the marinade ingredients in a bowl.
- Place the meat in a dish or bag and pour the marinade over it.
- Cover and refrigerate for 4 to 24 hours. Flip it once or twice.
- Take the meat out of the fridge 30 minutes before cooking.
- Preheat your oven to 325°F (163°C).
- Pat the meat dry with paper towels. Discard the used marinade.
- Heat a skillet over high heat and sear the meat for 2 minutes per side.
- Move the skillet to the oven or transfer the meat to a baking dish.
- Roast until the internal temp hits 130°F for medium-rare.
- Rest the meat on a board for 10 full minutes.
- Slice thin, against the grain, at a slight angle.
The sear is optional but it adds a nice crust. If you skip it, add about 10 minutes to the cooking time.
What Temperature Should You Cook To
This is where most people go wrong. They cook London broil until it is gray inside. That is a death sentence for this cut.
- Rare: 120°F to 125°F
- Medium-rare: 130°F to 135°F
- Medium: 140°F to 145°F
- Well done: 155°F and up (not recommended)
Pull the meat 5 degrees before your target temp. It keeps cooking while it rests. A 2-pound roast at 325°F usually takes 25 to 35 minutes after searing.
How To Slice Against The Grain
Look at the meat before you cut it. You will see lines running across the surface. Those are the muscle fibers.
Your knife should cut across those lines, not along them. Cut thin slices, about 1/4 inch thick. A slight angle gives you wider slices.
If you cut with the grain, the meat will be chewy no matter how well you cooked it. This step matters as much as the marinade.
Common Mistakes To Avoid
Even good cooks mess this up. Here are the big ones.
- Not marinating long enough. Two hours is not enough for top round.
- Cooking cold meat straight from the fridge. It cooks unevenly.
- Skipping the rest. Cutting too soon lets all the juice run out.
- Using a dull knife. It tears the meat instead of slicing it.
- Overcooking. There is no sauce that fixes a well-done London broil.
Another mistake is salting the meat right before cooking. The salt sits on the surface and pulls out moisture. Let the marinade do that job instead.
What To Serve With It
London broil goes with almost anything. Keep the sides simple so the meat is the star.
- Roasted potatoes with rosemary
- Steamed green beans with butter
- A simple garden salad
- Crusty bread for soaking up juices
Leftovers make great sandwiches. Slice them thin, pile them on a roll, and add a little horseradish mayo.
Storing And Reheating Leftovers
Keep leftover London broil in an airtight container in the fridge. It lasts 3 to 4 days.
Do not microwave it on high. That turns it rubbery. Warm it gently in a skillet with a splash of beef broth, or eat it cold.
You can also freeze slices for up to 2 months. Wrap them tight so they do not get freezer burn.
A Quick Note On Resting Time
Ten minutes is the minimum. Fifteen is better for a thick roast. The meat needs that time for the juices to settle back into the fibers.
If you cut it early, the board will be full of juice and the meat will be dry. Be patient here.
Final Tips For A Tender Result
Pick a roast that is at least 1.5 inches thick. Thin cuts cook too fast and dry out.
Use a thermometer every time. Guessing does not work with lean beef.
And always, always slice against the grain. That single habit is what makes the biggest difference between tough and tender.
With a long marinade, a low oven, and a sharp knife, you will get a London broil that is juicy and easy to chew. Give it a try this week and see for yourself.