double jigger bourbon or rye whiskey
half jigger simple syrup
3 dashes bitters
orange peel and maraschino cherry for garnish

  • mix whiskey, syrup, and bitters in glass with ice
  • garnish with orange peel and cherry

source: https://www.epicurious.com/recipes/food/views/old-fashioned-235804 and https://www.inspiredtaste.net/26965/old-fashioned-recipe/