The Posse is always shigging. Nothing sinister, mind you, as some define the term: “stealing” barbecue secrets. We’re always looking for techniques that will make us better cooks and that we can share with readers. “To become great at anything you learn by trying, by failing and from observing those who are greater than you,” Posse member Daniel Goncalves says. We first wrote about shigging in 2011, a few months after Posse member Marshall Cooper noticed that Aaron Franklin — then operating a small trailer joint in Austin — wrapped his briskets in butcher paper for part of the cook.…