Rick Browne, Ph.B takes a look at Australia’s love affair with barbecue in “Baang-gaa to Barbies: Australia’s Barbecue Heritage,” excerpted from the May/June issue of Burn! Magazine. Let me smash a common misconception about Australian barbecue: Down Under, they cook prawns —no one here “slips another shrimp on the Barbie.” In fact, cooking shrimp, er, prawns on a barbecue was …