It's easy to make tender and juicy Top Round Steak with our perfectly savory, sweet, and (slightly) spicy marinade and step-by-step guide for how to cook London broil.
Place the London broil on a cutting board. Use a sharp knife to score the top and bottom of the London broil, cutting ¼ inch deep, in long strokes, across the surface, spacing the cuts about ¾ inch apart. Then turn the London broil and score again, in perpendicular direction, to create a checkerboard pattern. Turn the London broil over and repeat on the other side. See photos for a reference.
In a small mixing bowl, combine the Dijon mustard, brown sugar, orange juice, soy sauce, fish sauce, ginger, garlic, and crushed red pepper. Mix well.
Place the London broil in a rimmed baking dish, or in a gallon zip bag. Pour the marinade over the top. If using a dish, cover the dish with plastic wrap and place in the refrigerator. If using a plastic bag, squeeze the air out of the bag, and zip tightly. Shake the bag around, and place it in the refrigerator
Marinate the London broil for at least 3 hours, but up to 24 hours.
To cook the London broil, take the London broil out of the marinade, and discard the remaining marinade. Use paper towels to dry off both flat surfaces of the London broil.
Preheat the broiler to 500°F. Move the top rack approximately 4 inches from the broiler. Set a large cast-iron skillet on the rack to preheat.
Once hot, carefully place the London broil in the cast iron skillet. Broil for 4 minutes per side, flipping once, 8 minutes total.
Remove from the oven and allow the London broil to rest for at least 5 minutes. Then slice into thin strips, against the grain, and serve warm.
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Notes
Cool the leftovers completely before transferring to an airtight container. Keep in the fridge for up to 3 days.
To freeze, wrap cooled leftovers tightly in plastic wrap or place in a freezer-safe airtight container, like a plastic zipper bag. Then wrap in a layer of aluminum foil for extra protection. Freeze for up to 3 months and thaw in the fridge overnight.