A "Single Grain" Whisky is one that is produced at a single distillery using any combination of 2 or more cereal grains.
Nonesuch cask 1 was the first Tasmanian Whisky to be produced with Corn as one of the grains within the mash bill.
The Corn delivers a delightful sweetness to the Whisky and along with the Rye & Malted Barley this recipe would eventually become known as Nonesuch Triple Grain.