Costco shoppers are divided over a new Kirkland Signature olive and rosemary “sourdough” bread. Multiple outlets report that many customers like the product’s taste and are buying it regularly, while others question whether it meets their definition of true sourdough. Critics point to what they describe as a long ingredient list and argue that genuine sourdough should be leavened only with a live sourdough culture and not with commercial yeast or other added leavening agents. They also contend that real sourdough should not include certain additives.
Supporters respond that the bread is labeled as sourdough and emphasize that sourdough can vary in formulation across brands and recipes. The dispute largely plays out online among shoppers using terms such as “sourfaux,” reflecting disagreement over how strict the standards for labeling should be. Both sides, however, focus on the same core issue: whether the Kirkland loaf’s ingredients align with common expectations for sourdough.
