Description

This Slow Cooker London Broil recipe delivers tender, flavorful meat infused with a savory marinade and accompanied by hearty vegetables. Perfect for a comforting meal, the beef is marinated overnight, seared for rich flavor, then slowly cooked until fork-tender. Finished with a thickened sauce, it’s a delicious and easy-to-prepare dinner.

Ingredients

Scale

Marinade

2 pounds London broil
¼ cup low-sodium soy sauce
1 Tbsp. balsamic vinegar
1 Tbsp. Worcestershire sauce
¾ cup beef broth (from total 1¾ cups)
1 Tbsp. brown sugar
½ tsp. dried rosemary
½ tsp. dried thyme
¼ tsp. black pepper
1 Tbsp. olive oil

Vegetables & Broth

1 medium onion, sliced
2 carrots, peeled and cut into chunks
2 potatoes, cut into chunks
4 garlic cloves
1 cup beef broth (remaining from total 1¾ cups)

Optional

1 Tbsp. cornstarch (for thickening sauce)

Instructions

Prepare Marinade. In a medium bowl, whisk together soy sauce, balsamic vinegar, Worcestershire sauce, ¾ cup beef broth, brown sugar, dried rosemary, dried thyme, black pepper, and olive oil until combined.
Marinate the Meat. Place the London broil in a resealable plastic bag or shallow dish, pour the marinade over it ensuring even coating. Seal and refrigerate for at least 4 hours or preferably overnight to infuse flavors.
Sear the Meat. After marinating, heat a skillet over medium-high heat. Sear the London broil on all sides for 2-3 minutes each to lock in flavors. Transfer meat and marinade to the slow cooker.
Prepare Vegetables. Arrange sliced onion, carrot chunks, potato chunks, and garlic cloves around the meat inside the slow cooker.
Add Remaining Broth. Pour the remaining 1 cup beef broth over the meat and vegetables until liquid reaches about halfway up the side of the meat.
Slow Cook. Cover and cook on low for 6-8 hours or until the meat is fork-tender.
Rest the Meat. Remove the London broil from the slow cooker and let it rest for 10-15 minutes before slicing against the grain.
Make Sauce (Optional). Strain the liquid into a saucepan. Mix cornstarch with cold water to make a slurry, add to liquid, and boil while stirring until thickened.
Serve. Slice the London broil and serve with cooked vegetables and drizzled sauce. Enjoy!

Notes

Marinating overnight enhances the flavor and tenderness of the meat.
Searing the meat before slow cooking locks in juices and adds depth of flavor.
Cut vegetables into uniform chunks to ensure even cooking.
Resting the meat after cooking allows juices to redistribute for better texture.
The cornstarch slurry is optional but recommended for a thicker, more flavorful sauce.

Prep Time: 15 minutes plus 4+ hours marinating
Cook Time: 6-8 hours
Category: Main Course
Method: Slow Cooking
Cuisine: American

Keywords: London Broil, Slow Cooker, Beef, Marinade, Comfort Food, Tender Meat, Easy Dinner