This here's a great marinade for any cut of beef, but I like to use it on steak. It contains basic ingredients that, when combined and allowed to blend, will give you a tender, juicy piece of meat every time.
In a medium bowl, combine the oil, soy sauce, vinegar, lemon juice, Worcestershire sauce, ground black pepper, mustard, onion, and garlic. Mix together well, and use to marinate your favorite meat.