The Shakespeare Code it is one of his own from "Henry V", which was probably written in early 1599. When questioning Shakespeare about witches, Martha remarks that he has written about witches; a reference to "Macbeth", which Shakespeare denies. At the time in which the episode is set, Shakespeare had yet to write "Macbeth" or "Hamlet", which prominently feature the paranormal, such as witches and ghosts. There are numerous other allusions to Shakespeare's plays. Just before the Doctor steps out of the TARDIS, he exclaims "Brave new world", from Act V Scene I of "The Tempest". In an early scene a sign is
Sweet potato chopped and used in dishes such as "mas huni". In Japan, both sweet potatoes (called "satsuma-imo") and true purple yams (called "daijo" or "beni-imo") are grown. Boiling and steaming are the most common cooking methods. Also, the use in vegetable tempura is common. "Daigaku-imo" is a baked sweet potato dessert. Because it is sweet and starchy, it is used in "imo-kinton" and some other traditional sweets, such as "ofukuimo". "Shōchū", a Japanese spirit normally made from the fermentation of rice, can also be made from sweet potato, in which case it is called "imo-jōchū". "Imo-gohan", sweet potato cooked with rice,