London-based Charles McCarthy, global cocktail consultant for Tullamore Dew Irish whiskey, offers up a special tip for Montserrat preparation: put a napkin over the rocks glass and place a sugar cube atop it, then douse the sugar in bitters, which allows the cube to soak up the perfect amount of flavoring. "You can actually watch the sugar drinking the bitters," McCarthy says. Then, simply drop the sugar cube into the glass, break it up, and proceed with the recipe.
Muddle brown sugar cube, bitters, and small amount of Tullamore D.E.W. in bottom of rocks glass. Fill glass with cubed ice. Stir to dilute, adding Tullamore D.E.W. slowly. Add more ice as necessary. Afterward, add apple juice and garnish with an orange twist.