In an old fashioned glass, brandy snifter, or small coffee glass, rim the outside with sugar.
Pour the rum (or brandy) into the glass and top with the espresso. Serve immediately.
Notes
Coffee versus Espresso Tip: If you don't have an espresso maker then we recommend making coffee using a pour-over or French press so it's strong. If all you have is a drip coffee maker then brew it a little stronger, we typically will use 1 1/2 tablespoons of ground beans for every cup of coffee.Prep Tip: Be sure to rim the glass before pouring the liquid. Wet the edge of the rim with water and then dip the edge into sugar.