Nikka Coffey Grain Made primarily from corn and distilled in Coffey pot stills at the Miyagikyo distillery, it offers a glimpse into the particularly smooth and charming style of grain whiskies that are essential components of Nikka Whisky blends. Nikka Coffey Malt is produced using a unique process in Coffey-style column stills, which are typically used for making grain whisky.