Garnish this classic cocktail with an orange twist and a maraschino cherry.
Combine first 3 ingredients in a large bowl; stir gently.
Funnel mixture into a clean 750-milliliter bottle, leaving an inch of headroom at top of bottle; seal with a cork or cap. Store in refrigerator or in a cool, dark place for long aging.
To make 1 cocktail, pour 2 ounces whiskey mixture into a pint glass filled with ice. Stir rapidly for 20 to 30 seconds. Strain into chilled cocktail glass or tumbler filled with ice. Garnish with an orange twist and a maraschino cherry.