using an apple to make a starter

hello...i'm new to this website, and am so excited to learn more.....i was reading the book 'bread of three rivers' by sara mansfield taber, and it talks about making a starter with an apple....does anyone know how to do this?...thanks, connie3ms

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William Alexander uses this method.  His website is and his new book details his year long pursuit (ie, obsession) of the perfect loaf of rustic, artisan bread.


The direct link to his method is