User-Friendly Guide to London Broil in the Slow Cooker

London Broil for the Slow Cooker

Background and History

London Broil is a dish that originated in the United States, despite its name suggesting British origins. The term “London Broil” originally referred to a cooking method rather than a specific cut of meat. Traditionally, London Broil is made with flank steak or top round steak, marinated and broiled or grilled quickly at high heat, then thinly sliced across the grain for tenderness. However, this slow cooker version offers a convenient alternative with equally delicious results.


2 pounds London Broil (flank steak or top round steak)

1 onion, thinly sliced

2 cloves garlic, minced

1 cup beef broth

¼ cup soy sauce

2 tablespoons Worcestershire sauce

1 tablespoon honey or brown sugar

1 teaspoon dried thyme

1 teaspoon dried rosemary

Salt and pepper to taste

2 tablespoons cornstarch (optional, for thickening)



Preparation Time

10 minutes

Cooking Time

6-8 hours on low heat


Place the thinly sliced onions and minced garlic at the bottom of the slow cooker.

In a small bowl, mix together beef broth, soy sauce, Worcestershire sauce, honey (or brown sugar), thyme, rosemary, salt, and pepper.

Place the London Broil on top of the onions in the slow cooker.

Pour the prepared sauce over the meat.

Cover and cook on low for 6-8 hours or until the meat is tender and easily shreddable.

Once cooked, remove the London Broil from the slow cooker and let it rest for a few minutes before slicing thinly against the grain.

If desired, thicken the sauce by mixing 2 tablespoons of cornstarch with 2 tablespoons of cold water. Stir the mixture into the hot liquid in the slow cooker and cook on high for 15-20 minutes until thickened.

Serve the sliced London Broil with the thickened sauce poured over the top.

Nutrition Facts

(Per Serving)

Calories: 300 kcal

Total Fat: 12g

Cholesterol: 100mg

Sodium: 800mg

Total Carbohydrates: 7g

Protein: 40g


London Broil is best when sliced thinly against the grain for maximum tenderness.

Feel free to customize the seasonings according to your preference. Add some red pepper flakes for a spicy kick or substitute fresh herbs for dried ones.

Leftover London Broil makes delicious sandwiches or can be used in salads and wraps.

Allergy Warning

This recipe contains soy sauce, which may contain wheat. Check the label for gluten-free options if necessary.

Be mindful of any allergies to ingredients such as garlic or onion.

Percival Langley
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