Last Sunday I hauled my Jambo pit to Austin. The first stop was John Lewis' house. Both Lewis and I had been invited to a backyard BBQ with John Mueller the next day. John Lewis is a pitmaster (I call him The BBQ Genius, food critics call him the BBQ savant) who works at Franklin BBQ in Austin for Aaron Franklin. Franklin's has been named the best BBQ joint in America. That also means best in the world, says John Mueller, because no place else cooks real BBQ except Texas. I help John Lewis on national KCBS BBQ competitions. John's…