Preparation

1. In a mixing glass, add the sugar cube (or a teaspoon of sugar) and the bitters and muddle.
2. Add the whisky and ice and stir until the sugar is dissolved for around one minute.
3. Add the absinthe to a chilled rocks glass or coupe and rinse it around the sides, discarding any excess liquid.
4. Pour the whisky mixture into the glass and garnish with a lemon twist.