If you go to the Baby Back Shak and ask for the "Rossman Platter, it's very likely they'll look at you with blank stare and say "excuse me, what did you ask for?" To members of the Texas BBQ Posse, the Rossman Platter may be the closest thing to BBQ greatness that Dallas has to offer. To backtrack, Jim Rossman, shown above on a recent trip to the Taylor Cafe, is a member of the posse who also happens to the the Dallas Morning News tech guru. This man knows his Mac computers and iPhone stuff, but he also knows…