Slow Cooker London Broil
5 CommentsUpdated Mar 10, 2026
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This Slow Cooker London Broil recipe takes a somewhat tough cut of meat and turns it into a flavorful, tender meat with delicious homemade sauce.
Have you ever wondered how to cook a London Broil? It’s easy as can be if you utilize your slow cooker. The low-and-slow cooking time transforms this lean cut into a flavorful, sliceable roast, and with my homemade marinade, you will be in heaven!
Key Ingredients
London broil: If you can’t find this cut in your meat department, ask the butcher.
Homemade Sauce: Low sodium soy sauce, balsamic vinegar, Worcestershire sauce, beef broth, brown sugar, dried rosemary, dried thyme, black pepper, and olive oil create a marinade of delicious flavors for the crockpot London broil.
Other Seasoning: Kosher salt and garlic cloves are added just before cooking.
Vegetables: Onion, carrots, and potatoes infuse the meat with delicious flavors as they cook together.
Cornstarch (optional): For thickening the gravy, if desired.
How to Make Slow Cooker London Broil
- Whisk the marinade and let the London broil soak up the flavor.
- Sear, then slow cook with onions, carrots, potatoes, and broth.
- Slice against the grain and spoon over the savory juices.
Tips & Variations
Different Cut: Want to try this recipe with another cut of meat? This recipe is great with a chuck roast, top round steak, or flank steak.
Add Wine: Add a half a cup of red wine (such as Merlot).
Other Vegetables: You can add mushrooms, celery, or green beans at the beginning of the cooking time.
How to Serve London Broil
Sides: This crockpot London broil recipe is a complete meal. If you want top it off, add a green salad and dinner rolls.
Other Starches: To feed more people you can serve this roast over steamed rice, or egg noodles.
Is searing the meat necessary?
Searing the beef before placing it in the slow cooker helps lock in the juices and adds flavor. You can skip it if you are low on time.
Slow Cooker London Broil Recipe
How to Video
Ingredients
- 2 pounds London broil
- ¼ cup low-sodium soy sauce
- 1 Tbsp. balsamic vinegar
- 1 Tbsp. Worcestershire sauce
- 1 ¾ cup beef broth, ¾ cup separated
- 1 Tbsp. brown sugar
- ½ tsp. dried rosemary
- ½ tsp. dried thyme
- ¼ tsp. black pepper
- 1 Tbsp. olive oil
- 1 medium onion, sliced
- 2 carrots, peeled and cut into chunks
- 2 potatoes, cut into chunks
- 4 garlic cloves
- 1 Tbsp. cornstarch, optional, for thickening
Instructions
- In a medium bowl, whisk together the soy sauce, balsamic vinegar, Worcestershire sauce, ¾ cup of the beef broth, brown sugar, dried rosemary, dried thyme, black pepper, and olive oil to create the marinade.
- Place the London broil in a resealable plastic bag or shallow dish and pour the marinade over the meat. Ensure the meat is evenly coated with the marinade. Seal the bag or cover the dish, then refrigerate for at least 4 hours, or preferably overnight, to allow the flavors to infuse the meat.
- After marinating, heat a skillet over medium-high heat. Sear the London broil on all sides for 2-3 minutes per side to lock in the flavors. Once seared, transfer the meat and the marinade to the slow cooker.
- Arrange the sliced onion, carrot chunks, potato chunks, and garlic cloves around the London broil in the slow cooker.
- Pour the remaining 1 cup of beef broth over the meat and vegetables. The liquid should come about halfway up the side of the meat.
- Cover and cook on low for 6-8 hours, or until the meat is fork-tender.
- Once the cooking time is complete, carefully remove the London broil from the slow cooker and let it rest for 10-15 minutes before slicing against the grain.
- If desired, strain the liquid from the slow cooker into a saucepan. In a small bowl, mix the cornstarch with a few tablespoons of cold water to create a slurry. Add the slurry to the strained liquid and bring to a boil, stirring constantly, until the sauce thickens.
- Serve the sliced London broil alongside the cooked vegetables and drizzle with the savory sauce. Enjoy!
Nutrition
Nutrition info is auto-generated. This information is an estimate; if you are on a special diet, please use your own calculations.
More Slow Cooker Roast Recipes
Worcestershire Pot Roast, Slow Cooker Pot Roast, and French Onion Pot Roast are rich, savory dinners that turn simple beef into fork-tender comfort food.
Hot Roast Beef Sandwiches and Cranberry Pot Roast offer sweet and savory twists that are perfect for family meals.
Apple Cider Pot Roast brings a subtle sweetness and cozy flavor that makes it ideal for fall dinners.
Love all your slow cooker recipes, can’t wait for dinner
That’s great to hear! Thank you Barbara.
In the recipe, you take the meat out of the marinade, brown it, place in slow cooker and add 1 cup of beef broth. But in the how-to video, you add the marinade to the slow cooker after browning the meat and no mention of the 1 cup of broth. I’m wondering which method is preferable?
I would add the marinade and the one cup of beef broth to the crockpot. The marinade has all of the flavors and the extra cup of broth ensures there is enough liquid for cooking.
Can the marinade be added to the crockpot?