Hi Dean, as Rossi explains in this blog post, "This short bulk fermentation is also why the recipe includes 1 teaspoon white vinegar. The vinegar adds a little background tang that’s hard to achieve with keto flour and the short fermentation time." Vinegar is not an uncommon ingredient in bread recipes, but it's not one we rely on very often. For more information about vinegar in yeast breads, check out this article. 

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