Place the sugar cube in the old-fashioned glass. If using simple syrup, pour it directly into the glass.
Add 2-3 dashes of Angostura Bitters on top of the sugar cube.
Gently muddle the sugar cube (if using) with the bitters, allowing them to dissolve and infuse the glass.
Add a large ice cube or a few ice cubes to the glass.
Pour the whisky over the ice.
Stir the mixture for about 10-15 seconds to blend the flavors and chill the cocktail.
Garnish your Old Fashioned with an orange peel twist and a maraschino cherry to add the final touch of elegance.
