The Whisky Sour

Wondering what to do with the left over whisky from St. Patrick's Day? Think whisky sour. There are a lot of recipes on the web for this classic, so I'll list what seem to be the most standard/popular:

The Whiskey Sour

3 parts whisky
2 parts lemon juice
1 part sugar syrup/ tsp powdered sugar

Shake ingredients over ice.
Strain into a sugar-rimmed glass.
Garnish with a lemon curl or a cherry.

Optionals:
a dash of fizzy water
a dash of egg white (ewwww)