I normally make an Old Fashioned with bourbon, usually Jim Beam black label 8-year aged. I tried it tonight with Tullamore Dew and I liked the result. Here is the recipe.
Place in tumbler, or more specifically, an old fashioned glass:
1 rounded teaspoon granulated sugar
2 maraschino cherries
1 section mandarin orange, peel removed (2 if small)
1 teaspoon club soda (water will do in a pinch)
Muddle the mixture well (it is best to have a muddler, but the back end of an ice cream scoop can also work)
Add 3-4 ice cubes
Pour 2 oz. of Bourbon or Whiskey
Add 3 dashes of Angastura Bitters
Stir the mixture
Most recipes call for garnishing with an orange slice. I don't because I am too impatient to get the first sip.
Pictured at left is a stainless steel muddler.