Malted Rye Whisky contains a mash bill (grain recipe) composed primarily of malted rye grain. To malt rye, the grains are soaked in water to encourage them to germinate. The grains are then dried with hot air right before sprouting in order to stop the process. Enzymes created in this process modify the grains' starches into different types of sugar and break down proteins into yeast-usable components.