In an Old Fashioned glass add sugar cube, bitters, and splash of whiskey muddle until blended.
Add one large ice cube and remaining whiskey, stir until sugar is mostly dissolved.
Garnish with orange twist.
If you don't have white sugar cubes, you can still make this drink. You can use ½ teaspoon of sugar with 1 teaspoon water and 3 dashes bitters.
I used a demerara sugar cube since it's all I had. No need to buy a full box of white ones if you already have something else on hand.
You could also use my cheater simple syrup method instead if you prefer. I would make the syrup then use 1 teaspoon of it in the cocktail.
Once know how to make an Old Fashioned, you can modify it to try a variety of differnt types. You can use tequila instead of the bourbon. Or you can add more flavors like fresh berries or even cinnamon.