To make the poultry scratchings, pull off all the leftover skin from the carcass. Lay the pieces right-side up on a baking tray (one with a lip to catch any fat that runs). Put them in the oven (around 160C-180C/Gas 3-4 is perfect, but they are adaptable, so perfect to cook when something else is in the oven). Bake until deep golden brown and crisp, about 15-20 minutes.