Such an ambitious undertaking! Am sure it will be worth the effort! Once upon a time I did a search on san francisco sourdough bread and printed this to tuck in my cookbook -
How to Make San Francisco Sourdough Bread Page-1 - interesting read and recipe is on the second page. Not sure if it beats direct ordering from
https://www.boudinbakery.com/index.cfm as I have been known to do! :0
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Not sure if I have free time...or if I just forgot everything I was supposed to do!