Mix all ingredients and beat with fork. Freeze steak for 30 minutes, then cut against the grain into 1/2" wide strips, about 4" long. Throw the steak into the marinade and let sit, covered, in the refrigerator for 4 hours.
Remove steak and let it sit at room temperature for 1 hour. Drain the marinade, reserving for basting. Throw steak onto grill and baste with reserved marinade.
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Marinade Sauce for Flank Steak recipe