Weetabix

According to the Twelfth Doctor, particle beams "probably taste[d] like Weetabix" to the Umbra. (COMIC: The Eye of Torment)

Behind the scenes
Doctor Who was used to promote Weetabix in 1975 and 1977.

The 1977 promotion included a television advert featuring a modified Dalek Supreme from Terry Nation's collection.