Irish Old Fashioned

Use 2:1 rich simple syrup for its listed portion.

Choose an Old Fashioned glass and chill it in advance.

Prepare an orange zest twist for garnish.

Stir the Irish whiskey, rich sugar syrup, and both types of bitters with ice until well chilled.

Strain the mixture into the pre-chilled glass filled with fresh ice, ideally using a large cube or block of ice.

Express the orange zest twist over the cocktail to release its oils, and place it as a garnish.