Named for Bourbon County, Kentucky, this all-American liquor is distilled from fermented grain. Straight bourbon is distilled from a "mash" of at least 51 percent corn; blended bourbon must contain not less than 51 percent straight bourbon. Sour mash bourbon is made by adding a portion of the old mash to help ferment each new batch, in the same way that a portion of sourdough starter is the genesis of each new batch of sourdough bread.



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