^^This is a good technique. My favorite flank steak marinade is equal parts Olive Oil, Balsamic Vinegar and Wooster with a couple cloves of garlic and a small palmful of Montreal Steak.
Traeger lil Tex, 2 Weber 22.5", UDS
Mop, Sauce & Two Smoking Barrels BBQ Team
They call me "Dave"
Veteran Noobian Warlord