What is Irish Grain Whiskey primarily distilled from?

Irish Grain Whiskey is primarily distilled from unmalted grains, which is key to its production process. The term "grain whiskey" generally refers to whiskey that is made from grains other than just malted barley, specifically using a mixture of grains, such as corn, wheat, or even some small percentages of malted barley for fermentation. This approach provides the whiskey with a lighter and smoother character compared to malt whiskey.

Using unmalted grains allows for a different flavor profile and more efficient production methods, such as continuous column distillation, which can produce a higher alcohol content with a cleaner taste. This is distinct from malted barley-based whiskeys, which are more robust and complex due to the different fermentation and distillation processes involved.

The other options listed do not accurately represent the ingredients or processes used in the production of Irish Grain Whiskey. Fruits and spices are not primary ingredients in whiskey making, while buckwheat and corn do not align with traditional practices for Irish grain whiskey, which focuses on the use of unmalted grains.