In a large resealable plastic bag, combine the oil, soy sauce, lemon juice, Worcestershire sauce, mustard, ground black pepper, garlic, and meat tenderizer.
Mix well, and add your favorite meat.
Seal the bag, and marinate in the refrigerator for 4 to 24 hours.
Notes: We use this with both chicken and steak. We mix it in a shaker cup and set some aside before putting it on the meat to use for brushing on the vegetables while grilling.