Costco devotees engage in heated online debate over ‘sourfaux’ bread

Costco’s new Kirkland Signature olive and rosemary sourdough bread is a hit with many shoppers, but it’s also renewed the debate about how many ingredients belong in genuine sourdough. For bread to be labeled sourdough, it should be leavened solely with a live sourdough culture, without commercial yeast or other leavening agents, and contain no additives or...