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The typical grain mixture for bourbon, known as the mash bill, is a minimum of 51% corn, with the remainder being rye, wheat, malted barley, or some combination of these. A mash bill that contains wheat instead of rye produces what is known as a wheated bourbon. The grain is ground and mixed with water.
Where itâs made: Rye was historically made in the Northeast, but today, itâs most frequently made by distilleries that also produce (and are usually better known for) bourbon. What defines it: Rye whiskey is made from mash that is at least 51 percent rye. The grain gives rye whiskey its spicy, sometimes peppery, flavor.