Part of The Alchemist‘s series of cocktails you should know. 

• 1 sugar cube
• 2 dashes Angostura bitters
• 1.5 oz bourbon or rye whisky
• Garnish: cocktail cherry, orange slice (optional)

Place the sugar cube in the bottom of an Old Fashioned glass, saturate it with the bitters, then add a few dashes plain water. Muddle until the sugar is dissolved, then add whisky, ice and stir. If you like, garnish with a cherry or a skewered cherry and orange slice. Serves 1.