This is so good and simple. Buy a tri-tip roast at the local meat shop, butcher, etc. Put it in a freezer bag and squirt 1/2 bottle of New York Style marinade in. Refrigerate over night.
The next day, fire up the old BBQ, slap that hunk-o-meat on and cook on medium heat to desired rare, medium or well.
I serve with grilled Asparagus and either mashed or baked potato.