Strength Cask

Shaved, Toasted & Re-charred wine casks (Jim Swan method) is a technique for reusing used wine casks in whisky production. The method enhances the intensity of oak notes and adds fruity elements as well as vanilla without overpowering the distillate.

Procedure

• Shaving: a thin shaving surface is removed from the inside of the wine cask to remove part of the previous aging and expose fresh oak.

• Toasting: the inside is lightly toasted, which develops aromas and facilitates the interaction between the wine's and the oak's characteristics.

• Re-charing: the inside is re-charred by heating, so a new charcoal layer forms and a new surface for contact with the whisky.

Effect on flavor and aroma

• Fruity notes such as red berries and other fruit nuances, often accompanied by vanilla and a creamy mouthfeel.

• Vanilla, caramelization and caramel tones from the oak's new contact, with potential for spice and light smoke.

• The overall profile is typically more complex and often longer in finish than with uncharred wine casks.

Applications and considerations

• The STR treatment is used to impart fruitiness and vanilla through the use of ex-wine casks and to refresh a cask without overpowering the distillate.

• Benefits: enables reuse of existing casks and adds new oak and fruity depth.

• Considerations: results vary with the cask history and the whisky; the process requires careful control to balance fruit, vanilla and oak notes.