Bacon

Bacon was a food prepared from pigs, originating on Earth. The Doctor destroyed a Glutonoid with a toxic mixture that was flavoured with, among other things; bacon. (DWBIT: The Glutonoid Menace) When the newly-regenerated Doctor demanded Amelia Pond "fry something" for him, she made him a plate of bacon. He began eating but spat it out in disgust, asking Amelia if she were trying to poison him. (DW: The Eleventh Hour)

Bacon in a sandwich

 * Whilst on Earth in 1963 Ace ordered four bacon sandwiches during the Shoreditch Incident. (DW: Remembrance of the Daleks)
 * The Doctor enjoyed "Marmalade and Bacon in a sandwich squashed together just so" during his stay at Nest Cottage. (BBCA: The Stuff of Nightmares)
 * Jack Harkness used a time store to save bacon sandwiches for a "year or two." (BBCR: Golden Age)