Step 1: Score the flank steak with a sharp knife, about 1/8-inch deep, in a diamond pattern; set aside.
Step 2: Mash the garlic with the mustard.
Step 3: Stir in the whiskey and oil.
Step 4: Place steak in a zipper type plastic freezer bag. Pour mixture over the steak and refrigerate overnight.
Step 5: Set out at room temperature for 1 hour before cooking. Remove steak from marinade, reserving marinade.
Step 6: Grill, using charcoal or gas grill. Cook over high heat 3 to 5 minutes per side, for rare. (Or cook under broiler in oven.)
Step 7: Heat reserved marinade in small pan to a boil.
Step 8: Slice the steak by cutting across the grain into 1/4-inch thick slices. Serve with heated marinade as a sauce.
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