Lapsang souchong

 was a black tea that the Seventh Doctor favoured. Beltempest thought that it smelled like tar, but tried some anyway and enjoyed it. (PROSE: Original Sin)

The Second Doctor liked it, comparing it favourably to Assam. (PROSE: Downtime)

General Jafrid drank it while travelling to Barclow. (PROSE: The Well-Mannered War)

Lapsang souchong was one of the many types of tea that Dr Jeremiah O'Kane left to Dr Colin Dove when he retired as director of Hawthorne. (HOMEVID: The Zero Imperative)