Whisky aged in Port casks is a type of single malt whisky that has been aged in barrels that previously held Port wine.
The port barrels add sweetness and complexity to the whisky, as the whisky absorbs the aromas and flavours of the Port. The wood of the barrel also has an impact on the flavour, as the wood imparts tannins, which add a slight astringency and spice to the whisky. The wood also affects the colour of the whisky, giving it a deep red or dark purple hue.
