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The idea is to hang the duck by the hook from the top shelf in the oven to roast, with the door slightly ajar, for 1 hour. However, it is probable that your oven isn't big enough to hold a hanging duck! In this case, aim to get the back skin to restaurant quality, which is a lot easier to bring to glass-like perfection anyway. Place the duck breast-side down on a rack set over a roasting tray and roast as above