For steak, red wine is a great marinade. If the meat looks a little dry, marinate in a mix of red wine and olive oil.. . For pork or chicken, italian or caesar salad dressing works well.. . I would recommend marinating for at least four hours, preferably overnight.. . Also, I would take the meat out of the refrigerator about one hour before cooking it ... let it warm up a little before putting it on the grill. This will allow it to loosen up and absorb flavor from the cooking process.. . With any of the above, just before putting the meat on the grill, you can rub it with salt, pepper, celery seed, or fennel for some extra flavor.