Place the sugar cube in an old-fashioned glass.
Wet it down with bitters and a short splash of club soda.
Crush the sugar with a wooden muddler, then rotate the glass so that the sugar grains and bitters give it a lining.
Add a large ice cube and pour in the Talisker 10 Single Malt Whisky.
Garnish with an orange twist and serve with a stirring rod if you’re so inclined.