Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1 1/2  pounds        flank steak -- (1/2" thick)
   1      clove         garlic -- minced
   2      teaspoons     dry mustard -- (Coleman's)
     1/4  cup           Jack Daniel's whiskey
                        vegetable oil
   2      tablespoons   butter
                        salt to taste
                        black pepper to taste

Preparation:

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.