How to make a perfect whiskey sour

Sunday is National Whiskey Sour Day, and Bosscat Kitchen & Libations stopped by the studio to show us how to make one! 

Here's a basic whiskey sour recipe that you can use at home: 

2 oz Whiskey

3⁄4 oz​​​​​​​ Fresh lemon juice

1⁄2 oz​​​​​​​ Simple syrup

1⁄2 oz​​​​​​​ Egg white (optional)