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Score the surface of the flank steak, and put it into a glass baking dish (not necessary just looks pretty).
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Drizzle on one tablespoon of oil, then sprinkle salt, pepper, oregano, and garlic.
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Finally, drizzle with one tablespoon vinegar.
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Turn the flank steak and repeat.
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Marinate for at least one hour, but the longer the better.
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If over cooked, flank steak because tough so it is best cooked to medium rare.
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I grilled the steak for about 5 minutes on each side and allowed it to rest for another 5 minutes before slicing against the grain.