Isabelle Palumbo of Austin shows off her beef rib at la Barbecue. (Photo ©Tom Fox) The Posse has always liked — loved, actually — the food at la Barbecue. The Austin joint opened in 2012. Our first visit was the next year. And we’ve consistently ranked the place among the very best in the state. So when Posse members Chris Wilkins and Tom Fox came to Austin recently, our first stop on a Saturday morning was the new la Barbecue, which moved out of its trailer location in August and into the Quickie Pickie on East Cesar Chavez. The barbecue,…