The turkey breast at Franklin Barbecue was amazing. (Photo by Tom Fox/DMN) On Posse tours, we've noticed that more joints are adding smoked turkey breast to their menus, so we added it to our standard order during our recent Best of Austin barbecue tour. Brisket, pork ribs, sausage... and turkey. The holy trinity -- plus one -- of Texas barbecue. All four places we visited had turkey. Mainly, it was good. The best we had was at Franklin Barbecue. It was worth the wait in line just to see the meat cutter take the turkey breast from its butter bath,…