If you have a frozen London broil and need to get dinner on the table, your oven is a reliable solution. Learning how to cook frozen London broil in oven is a straightforward process that can yield a great meal with a bit of know-how.
This guide will walk you through the safest and most effective methods. We’ll cover everything from thawing options to seasoning and the final cook. You’ll end up with a tender, flavorful main dish that didn’t require a last-minute trip to the store.
How To Cook Frozen London Broil In Oven
This is the primary method for cooking your steak directly from frozen. It uses a two-stage oven process: a low-temperature thawing stage followed by a high-temperature searing stage. This helps the steak cook more evenly.
What You’ll Need
- 1 frozen London broil steak (typically 1.5 to 2.5 pounds)
- Olive oil or another high-heat oil
- Kosher salt and black pepper
- Your favorite steak seasoning or herbs (like garlic powder, onion powder, smoked paprika)
- A wire rack (optional but recommended)
- A rimmed baking sheet or oven-safe skillet
- Meat thermometer (essential for best results)
Step-by-Step Instructions
1. Prepare the Oven and Steak
First, preheat your oven to 250°F. Take the frozen London broil directly from the freezer. Place it on a wire rack set inside a rimmed baking sheet. This allows air to circulate around the meat.
2. The Low-Temperature Thawing Stage
Put the baking sheet in the preheated oven. Let the steak warm through for about 30 to 40 minutes. This stage is not meant to cook it, but to gently raise it’s internal temperature and thaw the surface. The steak should still be very firm but may have started to soften slightly.
3. Season Generously
Carefully remove the baking sheet from the oven. Increase your oven temperature to 450°F. Pat the steak dry with paper towels. Drizzle it lightly with oil and rub it all over. Now, apply a heavy coat of salt, pepper, and your chosen seasonings on all sides.
4. The High-Temperature Searing Stage
Once the oven reaches 450°F, return the seasoned steak to the oven. For a 1.5-inch thick steak, cook for about 15-20 minutes. Then, use a meat thermometer to check the internal temperature.
5. Check for Doneness
For medium-rare, aim for an internal temperature of 130-135°F. For medium, aim for 140-145°F. Remember the temperature will rise about 5 degrees while resting. Because it started frozen, the doneness might be less even than a thawed steak, so check in a few spots.
6. Rest and Slice
Once it hits your desired temperature, take the steak out. Transfer it to a cutting board and let it rest for at least 10 minutes. This allows the juices to redistribute. Finally, slice the London broil very thinly against the grain. This is crucial for tenderness.
Alternative Method: Thaw First, Then Cook
If you have more time, thawing the steak first will give you more even results. The best way is to thaw it in the refrigerator for 24-48 hours. Once fully thawed, pat it dry, season, and cook in a 450°F oven for about 15-20 minutes, or until it reaches your desired doneness.
Why a Meat Thermometer is Essential
Cooking from frozen makes timing unpredictable. A meat thermometer removes all the guesswork. You won’t have to cut into the steak and lose juices. You’ll know exactly when it’s ready, preventing overcooking, which is the main cause of toughness.
Tips for the Best Results
- Always slice against the grain. Look for the long muscle fibers and cut perpendicular to them.
- Let the steak rest. Skipping this step leads to a dry steak.
- Don’t skip the pat-dry step before seasoning. A dry surface leads to a better crust.
- Consider a quick sear in a hot skillet after oven-cooking for more flavor.
- Leftovers make excellent sandwiches or salads.
Common Mistakes to Avoid
Avoid putting a heavily seasoned frozen steak straight into a super hot oven. The seasonings can burn before the inside thaws. Also, avoid cooking it at one low temperature the whole time; you’ll miss out on browning. Never skip resting the meat, and don’t slice it with a dull knife.
Understanding London Broil
London broil isn’t actually a specific cut of meat. It’s a cooking method. It usually refers to a lean, thicker cut like top round or flank steak that is marinated, cooked quickly with high heat, and sliced thinly.
Best Cuts for London Broil
- Top Round: The most common choice. It’s lean and benefits greatly from marinades and proper slicing.
- Flank Steak: Another popular option, known for its bold beefy flavor.
- Shoulder Steak: A good, often less expensive alternative.
Why It Can Be Tough (And How to Fix It)
These cuts come from well-exercised muscles, so they have less fat and more connective tissue. The keys to tenderness are: not overcooking it, slicing it very thinly against the grain, and sometimes using a marinade. Even cooked from frozen, these rules apply.
Seasoning and Marinade Ideas
Since you’re cooking from frozen, a wet marinade isn’t practical unless you thaw first. But a good dry rub or a post-cook sauce works perfectly.
Simple Dry Rub Combination
Mix 2 teaspoons kosher salt, 1 teaspoon black pepper, 1 teaspoon garlic powder, 1 teaspoon onion powder, and 1/2 teaspoon smoked paprika. Apply it liberally after the low-temperature stage.
Easy Pan Sauce (Make After Cooking)
While the steak rests, add a little broth to the baking sheet. Scrape up the browned bits. Simmer, then stir in a pat of butter for a simple, flavorful sauce to drizzle over the sliced meat.
What to Serve With London Broil
This hearty steak pairs well with many sides. Think of classic comfort foods that can soak up any juices or sauces.
- Mashed potatoes or roasted potatoes
- A simple green salad with a vinaigrette
- Steamed or roasted vegetables like green beans, broccoli, or asparagus
- Rice or crusty bread
Storing and Reheating Leftovers
Store any leftover sliced London broil in an airtight container in the refrigerator for up to 3-4 days. To reheat, avoid the microwave if possible, as it can make the meat tough. Instead, gently warm slices in a skillet with a little broth or cover them with foil and warm in a 300°F oven until just heated through.
FAQ Section
Can you cook a frozen London broil without thawing?
Yes, you can. The method described above using a low-then-high oven temperature is designed specifically for cooking a frozen London broil safely and effectively.
How long does it take to cook a frozen London broil in the oven?
The total time can vary based on thickness. Expect about 30-40 minutes at 250°F, followed by 15-25 minutes at 450°F. Always use a meat thermometer for accuracy.
What temperature should a London broil be cooked to?
For the most tender result, aim for medium-rare (130-135°F) or medium (140-145°F). Well-done London broil will likely be quite tough due to its leanness.
Why is my London broil tough?
The main reasons are overcooking, not slicing it thinly enough, or slicing with the grain instead of against it. Starting from frozen can also lead to uneven cooking if not done carefully.
Can I marinate a frozen London broil?
It’s not effective. Marinades cannot penetrate frozen meat. For best flavor, use a dry rub during cooking or apply a sauce after slicing. If you want to marinate, thaw the steak in the refrigerator first.
Is it safe to cook frozen meat in the oven?
Yes, it is perfectly safe as long as you cook it to the proper internal temperature. The USDA confirms that cooking frozen meat is safe, though it will take about 50% longer than cooking from thawed.
What’s the difference between London broil and flank steak?
Flank steak is a specific cut. London broil is a method applied to various lean cuts, with top round and flank steak being the most common choices. The cooking instructions are very similar.
Cooking a frozen London broil in your oven is a handy skill for busy nights. By following the two-stage oven method, using a thermometer, and always slicing against the grain, you can turn a freezer staple into a satisfying dinner. Remember, the extra steps of low-heat thawing and high-heat finishing make all the difference in achieving a result that’s cooked through and still flavorful.