Sourdough Insights When Martina left us with her sourdough she started a journey to visit ten sourdough lovers, people for whom sourdough is important. People who got passionate about it, like you are... In a new book called "Sourdough, Four days to happiness" the journey of this sourdough is written in a very entertaining way by Martina. To find out how the sourdough received its name you have to read the book , or watch the movie of my latest Quest for Sourdough.