Grilled Marinated Flank Steak
London Broil

Marinate Overnight -
Tenderness and Flavor

Favorite Restaurant Beef Recipe

Flank Steak is a flat, thin cut of beef that comes from a well-exercised portion of a cow so marinating is a requirement for tenderness. A good marinade also adds great flavor to the steak.

When marinated for a proper amount of time and cut properly, the steak becomes quite tender - unless it is over-cooked.

It is still one of the more affordable cuts of beef despite the fact that London Broil is a very popular meal.

This recipe is perfect for summertime suppers. Preparation time does not include the time needed for marinating.

Marinades are seasoned liquids containing tenderizing ingredients, either acidic foods such as lemon juice, vinegar, and tomato juice, and / or other tenderizers and flavor enhancers such as mustard, sugar, sherry or other wine or alcohol, ginger and soy sauce.

Fruit is also frequently added to marinade recipes. The specific combination of ingredients give the meat the different flavors people like.

You can use a marinade to baste the meat while grilling, as in this recipe, but you should never consume the marinade unless it has been thoroughly cooked to make certain all potentially harmful bacteria are destroyed.

Grilled Marinated Flank Steak

Favorite Restaurant Beef Recipe

Preparation time: 10 - 15 minutes. Serves 4.


  • 1 1/2 pounds whole flank, trimmed and scored


Ingredients for Marinade:

  • 2 tablespoons soy sauce
  • 2 tablespoons dry sherry
  • 2 tablespoons Dijon mustard
  • 3 tablespoons brown sugar
  • 1/2 teaspoon cayenne (or to taste)

Instructions for Marinade and Marinating the Steak:

  • Mix the marinade ingredients together in a large, shallow glass casserole dish
  • Save 1/4 of the marinade for basting the steak during grilling
  • Score the steak and add it to the marinade
  • Cover with plastic wrap and refrigerate for 8-10 hours but turn the steak several times during the marinating process


Instructions for Grilling:

  • Light the grill and heat to medium-high and when hot, add the steak
  • Grill for about 5 -6 minutes per side brushing each side generously with the marinade
  • Let sit sit for about 5 minutes off the heat in order for it to reach the desired temperature (see below)


To Slice and Serve:

  • Slice the steak across the grain into thin (1/4 inch) slices
  • Serve with Horseradish Sauce or your favorite sauce

Cooking Temperatures: (I do not recommend cooking flank steak beyond medium. It may get a bit tough.)

Rare: 130 - 140 degrees F
Medium-Rare: 140 - 150 degrees F
Medium: 150-160 degrees F

Enjoy your London Broil and the company of those you share it with!


Did you know? London Broil is the name of a recipe or method of cooking; it is not the name of a cut of beef. The recipe first appeared in print in the U.S. in the early 1930's, and consisted of marinated flank steak, broiled or grilled and sliced thinly across the grain.