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What should be potash? What are you supposed to do with it? Quite simply, similar to yeast, potash ensures that flat pastries such as gingerbread and other heavy doughs with a high sugar content rise. Unlike the yeast, the dough does not go up in height, but in width. Attention: Just because the dough goes into the width instead of height it is important to leave enough space between the individual cookies or the gingerbread when baking!