Step 1.
- Chill an Old Fashioned glass by filling it with ice water and setting it aside.
Step 2.
- In a mixing glass, add 1 sugar cube and a few dashes of aromatic bitters.
Step 3.
- Muddle the sugar and bitters together until the sugar dissolves.
Step 4.
- Add 2 ounces of Irish whiskey and ice to the mixing glass.
Step 5.
- Stir well for about 20-30 seconds to chill and dilute.
Step 6.
- Discard the ice water from the chilled Old Fashioned glass.
Step 7.
- Strain the mixture into the prepared glass over a large ice cube.
Step 8.
- Express the oils from an orange twist over the surface and drop it in as garnish.