Rogue Planet by Greg BearReleased soon after The Phantom Menace, this was the first ever novel about Obi-Wan Kenobi and his apprentice, the young Anakin Skywalker. In the story, Obi-Wan and Anakin are sent on a mission to strange planet where technology is grown rather than construction.
Rogue Planet is not only a book about Obi-Wan and Anakin learning to work together, but is also a prequel of sorts to the New Jedi Order series set 20 years after Return of the Jedi.
Buy from Amazon!
This is a prequel era book from the Legends timeline. It may be contradicted by newer books, movies, or TV shows (if so, just think of it as an alternate universe).