Whiskey Sour

Tart, a little sweet, and impossible to mess up once you've got the right tools.

Ingredients
2 oz bourbon
¾ oz fresh lemon juice
½ oz simple syrup
1 egg white (optional, for the classic foam)
Angostura bitters, for garnish

Instructions
Add all ingredients to a shaker without ice and shake hard for 15 seconds — this "dry shake" builds the foam. Add ice and shake again until well-chilled. Strain into a rocks glass over fresh ice. Finish with a few drops of bitters on top.