Suddenly you hear a creak and a hinged slot at the bottom of the door bursts open. Before you can even react to the startling events, the jug and plate are wisked away, to be replaced a wooden bowl of oat gruel.
You scream to the person, that there has been a mistake, but the guard, or whoever it is, doesn't seem to hear and you are left alone again.
The gruel, looking a lot better than the mouldy cheese, you find is tasty. Though your hunger being what it is, paper would probably taste just as good.