Can't decide between a post-dinner drink and a hit of caffeine with something sweet? This mocha cocktail should satisfy both cravings.
Combine chocolate and sugar in a cocktail shaker. Pour espresso shot over chocolate mixture; stir until smooth. Add vodka and a few ice cubes. Shake vigorously several times, then strain into a chilled martini glass. Spoon over top a few tablespoons of heavy cream that's been whipped just until silky and thick; stir with a toothpick to create streaks. Serve immediately.