Step 1.
- Place the sugar cube in an Old Fashioned glass.
Step 2.
- Add a few dashes of Angostura bitters onto the sugar.
Step 3.
- Muddle the sugar and bitters until the sugar has dissolved.
Step 4.
- Add ice cubes to the glass.
Step 5.
- Pour in the dark rum over the ice.
Step 6.
- Stir gently to combine the flavors.
Step 7.
- Express the oils from an orange twist over the drink, then add the twist as garnish.