Rusty

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

Use these specified component styles: Peated single malt whisky.

Select and pre-chill an Old Fashioned glass.

Prepare an orange zest twist for garnish.

Stir the Cuban rum, Amontillado sherry, peated single malt whisky, and rich sugar syrup with ice until well chilled.

Strain the mixture into the ice-filled Old Fashioned glass.

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