What term describes the grain recipe used in distilling?

The term that describes the grain recipe used in distilling is "Mash Bill." A mash bill refers to the specific combination of grains that are used to produce whiskey or bourbon. This recipe is crucial because it determines the flavor profile, character, and style of the final spirit. The grains included can vary widely, typically involving a mix of corn, rye, barley, and wheat, and each contributes different flavors and aromas.

Using a mash bill allows distillers to craft unique expressions and styles of bourbon, directly influencing the taste and quality of the spirit. For example, a bourbon with a high corn content will be sweeter and fuller-bodied, while one with a higher percentage of rye will tend to be spicier and more robust.

The other options provided do not accurately capture the essence of the grain recipe in this context. Fermentation refers to the process in which yeast converts sugars from the mash into alcohol, while "dough" is not a term commonly associated with distillation but rather with baking. "Grain blend" might suggest a combination of grains but lacks the specificity and established terminology of "mash bill" in the context of whiskey production.