What is a feature of some Irish whiskey?

Irish whiskey is known for its distinctive production methods, and one of its features is the use of unmalted barley. This practice contributes to the unique flavor profile of certain Irish whiskeys. The inclusion of unmalted barley during the mashing process creates a smooth and light spirit, differentiating it from other whiskey styles.

In addition to unmalted barley, Irish whiskey can also include malted barley, and its production often employs a combination of traditional and modern techniques that can vary by distillery. This characteristic helps define the complexity and variety within Irish whiskey as a whole.

The other options, while related to whiskey production, do not specifically highlight the traditional features associated with Irish whiskey and its distinctiveness compared to other types of whiskey.