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A half sour pickle has a wonderful crisp bite, and a tangy slightly sour taste. Depending upon the pickle spice blend that you choose to use, you can vary the flavor slightly while still retaining the basic principles of the half sour.
In distilling 'sour mash' is the process of using up to 1/3 of the stillage (ie the grains left after in the wash after fermentation & distilling) in the next batch of mash. The pH is low and it helps save water in the distillery.