Squeeze an orange twist inside an Old Fashioned glass to release the oils. Place a sugar cube in the base of the glass with a dash of Tomatin 12 Year Old and Black Walnut bitters. Break the sugar cube down and add a single measure of Tomatin 12 Year Old followed by several ice cubes. Stir around 25 times before adding the final measure of Tomatin with more ice. Stir another 25 times or until the sugar granules have dissolved and the drink is sufficiently chilled