How To Cook London Broil In Slow Cooker [GUIDE]

London Broil, despite its name, isn’t a cut of beef but rather a cooking method traditionally involving marinating and broiling a lean cut like top round or flank steak. Known for its robust flavor and relatively affordable price, London Broil can be slightly tough if not prepared properly, making it an ideal candidate for slow cooking. Slow cooking allows the meat to absorb the flavors of marinades and seasonings while breaking down its muscle fibers, resulting in a tender, juicy, and deeply flavorful dish. Using a slow cooker not only enhances the texture of the meat but also frees you from the constant attention needed on the stovetop or oven, making it perfect for busy households or weekend meal prepping.

How Long To Cook London Broil In Slow Cooker

The cooking time for London Broil in a slow cooker depends on the thickness of the cut and the cooking temperature setting. Typically:

• Low setting: 6 to 8 hours
• High setting: 3 to 4 hours

A thicker cut, around 1.5 to 2 inches, will lean toward the longer end of these ranges. Slow cooking works by breaking down connective tissue over time, so resist the temptation to cook it faster; high heat can lead to a tough, dry interior. Remember, the goal is to have meat that’s tender enough to slice thinly while retaining juiciness.

How To Tell If It Is Done

Determining doneness for London Broil is slightly different from more tender cuts. The ideal slow-cooked London Broil should be fork-tender but still hold its shape. Here’s what to check:

1. Texture: Press lightly with a fork; it should give easily but not fall apart completely like shredded beef.
2. Juices: When pierced, the meat should release clear juices, not blood-red liquid.
3. Internal Temperature: For a safe yet tender result, aim for 145°F for medium-rare and 160°F for medium. Because slow cookers maintain consistent low heat, the meat often continues to cook slightly after removal.

Ingredients Needed

To achieve a succulent London Broil in the slow cooker, you’ll need:

• 1 London Broil cut (1.5-2 lbs, ideally top round or flank steak)
• 1/4 cup soy sauce (or tamari for gluten-free)
• 1/4 cup Worcestershire sauce
• 2 tablespoons olive oil
• 2 tablespoons balsamic vinegar or red wine vinegar
• 4 cloves garlic, minced
• 1 large onion, thinly sliced
• 1 teaspoon black pepper
• 1 teaspoon smoked paprika
• 1 teaspoon dried thyme or rosemary
• Optional vegetables: carrots, potatoes, or mushrooms for a one-pot meal

This combination ensures a rich umami flavor while tenderizing the meat during the slow cooking process.

How To Cook London Broil In Slow Cooker

1. Marinate (Optional but recommended): Combine soy sauce, Worcestershire sauce, olive oil, vinegar, garlic, and seasonings in a bowl. Coat the London Broil and refrigerate for 4-24 hours.
2. Sear the Meat (Optional but adds depth): Heat a skillet over medium-high heat and sear each side for 2-3 minutes until browned. This step locks in juices and enhances flavor.
3. Prepare the Slow Cooker: Place sliced onions at the bottom for a flavorful bed, then add the meat on top. Pour any remaining marinade over the meat. Add optional vegetables around the meat.
4. Cook: Cover and cook on low for 6-8 hours or high for 3-4 hours. Avoid lifting the lid too frequently, as this releases heat and extends cooking time.
5. Rest and Slice: Remove the meat and let it rest for 10-15 minutes before slicing thinly against the grain to maximize tenderness.

When Things Go Wrong

Even in slow cookers, issues can arise:

• Tough Meat: Usually caused by cooking too short a time or using too high heat. Ensure the meat is fork-tender before slicing.
• Dry Meat: Can happen if overcooked or if the meat is extremely lean. Searing and using a marinade with some acid (vinegar) helps retain moisture.
• Too Watery: Excess liquid can dilute flavors. After removing the meat, simmer the sauce on the stovetop to reduce and concentrate flavors.

Expert Tips

• Always slice against the grain-this significantly improves tenderness.
• Marinating overnight isn’t strictly necessary, but it dramatically enhances flavor and helps tenderize.
• Layer onions and vegetables underneath the meat to act as a natural trivet, preventing overcooking and adding flavor.
• Avoid lifting the lid during cooking; slow cookers rely on trapped steam and heat to work effectively.
• For an extra depth of flavor, finish the meat with a quick broil in the oven for 2-3 minutes before slicing.

Can I Do This Without A Slow Cooker?

Yes, but the process differs slightly:

• Oven method: Use a low temperature (275-300°F) and cover the meat in a roasting pan with marinade. Cook 2-3 hours until fork-tender.
• Stovetop: Use a heavy pot or Dutch oven with the lid on. Cook over very low heat for 2-3 hours, turning occasionally and basting with juices.

The slow cooker’s advantage is consistent low heat and minimal supervision.

Reheating Leftovers In Slow Cooker

Leftover London Broil can be gently reheated in a slow cooker to preserve moisture:

1. Slice the meat thinly.
2. Place in the slow cooker with any remaining juices or a splash of broth.
3. Heat on low for 1-2 hours until warmed through. Avoid high heat, as it can dry the meat.

This method keeps the meat tender and flavorful for a second meal without overcooking.

FAQs

What Is London Broil, And Why Is It Good For Slow Cooking?

London Broil is a lean cut of beef, typically from the top round or flank, known for its robust flavor but relatively tough texture. Slow cooking helps break down the connective tissue, making the meat tender and flavorful.

Do I Need To Sear London Broil Before Putting It In The Slow Cooker?

Searing is optional but recommended. Browning the meat on all sides in a hot pan before slow cooking enhances flavor through the Maillard reaction and helps lock in juices.

How Much Liquid Should I Add To A Slow Cooker When Cooking London Broil?

You should add about 1/2 to 1 cup of liquid, such as beef broth, wine, or a marinade. Too much liquid can dilute flavor, while too little can result in a dry or unevenly cooked roast.

What Cooking Time And Temperature Are Best For London Broil In A Slow Cooker?

Cook on LOW for 6-8 hours or on HIGH for 3-4 hours. Cooking low and slow is ideal to ensure the meat becomes tender without drying out.

Should I Marinate London Broil Before Slow Cooking?

Marinating is optional but beneficial. A marinade with acidic ingredients like vinegar, citrus juice, or wine can help tenderize the meat while adding flavor.

Can I Cook Vegetables With London Broil In A Slow Cooker?

Yes, root vegetables like carrots, potatoes, and onions can be added. Place them at the bottom of the slow cooker, as they take longer to cook than the meat.

How Do I Know When London Broil Is Fully Cooked In A Slow Cooker?

The meat is done when it reaches an internal temperature of 145°F (63°C) for medium-rare or 160°F (71°C) for medium. It should also be tender and easily pulled apart with a fork.

How Should I Slice London Broil After Slow Cooking?

Slice the meat thinly against the grain. This shortens the muscle fibers, making each bite more tender and easier to chew.

Can I Use The Cooking Juices As A Sauce Or Gravy?

Yes, the juices can be thickened with cornstarch or flour to make a flavorful gravy. You can also add herbs or a splash of wine to enhance the taste.

How Can I Store And Reheat Leftover Slow-cooked London Broil?

Store leftovers in an airtight container in the refrigerator for up to 3-4 days or freeze for up to 2-3 months. Reheat gently in the microwave or on the stovetop with a little broth to prevent drying out.