Slice the orange. Just 1 half of a thin slice.
Slice and pit the cherry. Fresh is better than maraschino.
Throw the fruit in a shaker or a pint glass.
Add a spoonful of simple syrup because it helps the medicine go down, the medicine go down. Less than a tsp. (You can make this by boiling 1 pt sugar to 1 pt water.)
8 drops bitters. Exactly. Yes. Exactly.
Throw some ice in there real nice.
Pour two ounces of some delicious bourbon in the shaker.
Stir politely. Don't shake it. It's not a polaroid.
Put some fresh ice in your old fashioned glass and strain over the ice. I like to make these big cubes. They melt more slowly and look awesome.
You could garnish with an orange peel or a cherry but I like it just like this.