What Is the Best Temperature to Cook London Broil?

By Michael Ferguson

London broil is a popular cut of beef that is known for its rich flavor and tenderness. Whether you are cooking it for a special occasion or just for a family dinner, getting the temperature right is key to achieving the perfect texture and taste.

What Is London Broil?

Before we dive into the best temperature to cook London broil, let’s first define what it is. London broil refers to a specific cooking method rather than a specific cut of beef.

Traditionally, it involves marinating flank steak and then grilling or broiling it. In modern times, however, the term “London broil” has come to refer specifically to top round steak that is marinated and grilled or broiled.

Choosing Your Cut

When it comes to choosing your cut of London broil, there are two main options: flank steak or top round steak. Flank steak tends to be more flavorful but can be tougher if not cooked properly. Top round steak is leaner and generally more tender but can be less flavorful.

The Best Temperature

So, what is the best temperature to cook London broil? The answer depends on the cut you choose and how well-done you like your meat.

For flank steak, which tends to be thicker than top round steak, aim for an internal temperature of 130-135°F (54-57°C) for medium-rare or 140-145°F (60-63°C) for medium. It’s important to note that flank steak should never be cooked beyond medium as it will become tough and Chewy.

For top round steak, which is thinner than flank steak, aim for an internal temperature of 125-130°F (52-54°C) for medium-rare or 135-140°F (57-60°C) for medium.

How to Check Temperature

To check the temperature of your London broil, insert an instant-read meat thermometer into the thickest part of the steak. Be sure not to touch bone or grill grates as this can skew the reading.

Let It Rest

Once your London broil reaches its desired temperature, remove it from the heat and let it rest for 5-10 minutes before slicing. This allows the juices to redistribute throughout the meat, resulting in a more tender and flavorful final product.

  • Flank steak: 130-135°F (54-57°C) for medium-rare or 140-145°F (60-63°C) for medium
  • Top round steak: 125-130°F (52-54°C) for medium-rare or 135-140°F (57-60°C) for medium.

The Bottom Line

Cooking London broil to the proper temperature is essential for achieving that perfect balance of tenderness and flavor. Whether you choose flank steak or top round steak, following these guidelines will help you achieve a delicious and satisfying meal every time.