Sandor did a workshop in Autumn 2016 for Kickstarter funders of Masontops (a small enterprise making fermentation tools), which they have edited into a series of short instructional videos addressing different topics and questions. Link to them here:
https://www.masontops.com/pages/sandor-katz-workshop
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Those are awesome videos! We’re huge fans of yours and always enjoy hearing/watching you talk about the joys of fermentation!