Grilled London Broil

London Broil is simply a steak that's been tenderized by marinating, then broiled or grilled and served thinly sliced across the grain. Our flavorful homemade marinade makes our Grilled London Broil sizzle with taste!

Serves: 6

Chilling Time: 1 hr
Cooking Time: 30 min
What You'll Need:

1 (2-pound) London broil steak (beef top round)

3/4 cup balsamic vinegar, divided

1/4 cup olive oil

1/2 cup spicy brown mustard, divided

2 cloves garlic, minced

1 1/4 teaspoons salt, divided

1/2 teaspoon black pepper

1/4 cup (1/2 stick) butter

4 sweet onions, thinly sliced

What To Do:

1. Place steak in a large resealable plastic bag.

2. In a medium bowl, combine 1/2 cup vinegar, the oil, 1/4 cup mustard, the garlic, 1/2 teaspoon salt, and the pepper; mix well. Pour over steak then seal bag and chill 1 hour.

3. Meanwhile, in a large skillet over medium-high heat, melt butter. Add onions and saute 12 to 15 minutes, or until very tender, stirring occasionally. Add remaining vinegar, mustard, and salt. Reduce heat to medium-low and cook until mixture thickens, stirring often.

4. Preheat grill to high heat. Grill steak 12 to 15 minutes for medium-rare, or to desired doneness beyond that, turning frequently; baste often with marinade during only the first 5 minutes of cooking. Thinly slice steak against the grain and serve topped with sauteed onions.