6 ounces Bourbon whiskey
2 level teaspoons sugar
Place between 20 and 40 mint leaves (or a 4-6 sprigs) in a pint glass or martini shaker. Sprinkle sugar over it, pour in Bourbon, and muddle. Stir a bit to incorporate sugar and Bourbon.
Let sit for at least 15 minutes (this would be an ideal time to go off and have a barbecue).
Add ice to mixture and shake (optional).
Fill two Old Fashioned glasses with finely crushed ice and strain mixture into glasses. Optionally, top it off with a splash of club soda.
Add a short straw and garnish with a nice mint sprig.