You actually only boil them for a very brief period to just affect the outer-most crust of the pretzel. There are specific directions for the boiling step in this recipe that you could apply to the sourdough pretzels: http://www.kingarthurflour.com/recipes/high-fiber-pretzel-rolls-recipe. If you have any further questions, please feel free to call our Baker's Hotline at 1-855-371-2253 and we'd be happy to answer them at this time. Happy Baking! Jocelyn@KAF

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