Straight Rye Whiskey uses the same distilling methods as bourbon. However, it differs in its main ingredients. While straight bourbon uses corn, rye whiskey contains at least 51% rye resulting in a less sweet whiskey. And, like bourbon, the remainder of the mash is made from a variety of grains. These days, only small quantities of straight rye are made, but there are signs of renewed customer interest. At 101°, it has a rich, balanced aroma of vanilla and spice.