Ice
2 fluid ounces chocolate liqueur
1 1/2 fluid ounces vodka
1/2 ounce grated chocolate

Fill a cocktail shaker with ice.
Add the chocolate liqueur
and vodka to the shaker.
Shake briskly to mix and chill.
Strain into a chilled martini glass.
Garnish with the chocolate.

You will clearly need to make more.

5 minutes

whatever you think is polite