Cast Iron Charcoal and Smoker TrayDescription Turn your favorite Napoleon gas grill into a charcoal grill and smoker for smoky charcoal flavor. The Cast Iron Charcoal and Smoker Tray is easy to use. Remove the cooking grids and sear plates over at least two burners. Place the Cast Iron Charcoal and Smoker Tray directly onto the gas burners. Add a single layer of charcoal to the cast iron tray then turn on the gas burners and replace the cooking grids. Allow the charcoal to ignite and