I came up with this marinade for sirloin steak tips purchased from Trader Joe, but I believe it should work great on certain other kinds of beef such as flank steak. These packets of Good Season Zesty Italian dressing mix are like magic -- they make many things taste great. For example, I heard that a college I attended which served some of the yummiest Buffalo wings in its dining halls used that dressig mix to flavor the wing sauce.