Preparation / Directions:
Score the flank steak with a sharp knife, about 1/8-inch deep, in a diamond pattern; set aside. Mash the garlic with the mustard. Stir in the whiskey; pour mixture over the steak and refrigerate, covered, overnight. (Easiest done in a Zip-Loc bag). Set out at room temperature for 2 hours before cooking.
Grill, using charcoal or gas grill. Cook over high heat 3 to 5 minutes per side, dotting each side with butter while cooking.
Slice the steak immediately by cutting across the grain into 1/4-inch thick slices. Sprinkle with salt and pepper.
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