Sausage

A sausage was a food made of meat, generally associated with the planet Earth. Sausages and burgers were foods common to barbecues. (TV: The Power of Three) They could also be included as part of a full English breakfast, (PROSE: Slow Decay) with mashed potatoes, (TV: Born Again) or with chips. (PROSE: I Am A Dalek)

Throughout his life, the Doctor occasionally mentioned sausage, usually in a metaphorical way. The Tenth Doctor once described a hot dog, a kind of sausage, as "the Cyberman of food". (TV: The Age of Steel) The Sixth Doctor knew an amusing anecdote involving a sausage, which he once recounted to a convocation of lexicologists from the Articulate Worlds. (AUDIO: ...ish) Whilst in the Land of Fiction, the Second Doctor said that, were the Master of the Land's plans to go through, "Mankind would be like a string of sausages, all the same!" (TV: The Mind Robber)

Subsequent to his regeneration, the Tenth Doctor said he would take Rose Tyler home, where she could enjoy sausage and mash, along with fish and chips, beans on toast, turkey and nut loaf. (TV: Born Again)

Professor Amelia Rumford was fond of sausage sandwiches, believing that eating them helped one think. (TV: The Stones of Blood)

The Seventh Doctor cooked a breakfast of fried eggs, bacon, sausages and fried potato slices for Justine and Vincent Wheaton at Smithwood Manor. (PROSE: Cat's Cradle: Warhead)

Amy Pond and Rory Williams once ate sausages for breakfast. Amy stole one of Rory's sausages. (WC: Pond Life)

A small sausage factory on Smarley's World served as the power base for the SSSSSSS. (PROSE: Down)

When Henry Gordon Jago used the German word "doppelgänger", Ellie Higson believed that he was speaking of a kind of sausage. (AUDIO: The Spirit Trap)

At a Christmas market in Salzburg, the Eighth Doctor, Liv Chenka and Helen Sinclair had a choice of sausages, including bratwurst, käsekrainer, bockwurst and knackwurst. (AUDIO: Better Watch Out)

A far-off planet the Tenth Doctor holidayed on was almost invaded by Sontarans for their sausages, which they believed to be the best in "the whole of the universe". (PROSE: Dr. Tenth)

In Pete's World, Henrik's Surprise was an ice cream flavour made by Millington and exclusively sold in Henrik & Son. The flavour comprised of sausage sorbet layered with caper cream, and a unique brulee of bacon toffee, which was kept crispy with Gemini12. (GAME: Cybus Spy)

Information from invalid sources
A poster in a chip shop which Graham O'Brien once visited featured a container of a sausage and chips, along with the word "sausage" in white, and a message beneath beginning with "The only ch". (NOTVALID: The Universe is Calling)