A simple sign displaying a turkey marks Greenberg Smoked Turkey offices in Tyler. (Photo ©Chris Wilkins/Texas BBQ Posse) TYLER, Texas – As a Greenberg Smoked Turkey rolls off the production line – hickory-cured to its distinctive mahogany hue, sealed in plastic, then packed into its distinctive white box with red and black lettering – it passes beneath a small mechanical press. The press drives two copper-colored staples into the box, to seal it. That stapler is the first and only machine you’ll find on Greenberg’s production line. Up to that point, every step in creating this world-famous delicacy – “The…