To make a classic Whiskey Sour, you need bourbon whiskey, fresh lemon juice, and simple syrup as the main ingredients. Optionally, you can add egg white to create a smooth, foamy texture. Here is a simple step-by-step recipe: Ingredients:

• 45-60 ml Bourbon Whiskey
• 25-30 ml Fresh Lemon Juice
• 20-22.5 ml Simple Syrup (or maple syrup as a variation)
• Optional: Few drops or 1 egg white for foam
• Garnish: Orange slice, lemon peel, and a cocktail cherry

Method:

1. Pour bourbon, lemon juice, simple syrup, and egg white (if using) into a cocktail shaker.
2. Shake well without ice first if using egg white to incorporate foam (called a dry shake).
3. Add ice and shake again until cold.
4. Strain into a rocks glass filled with ice or a chilled cocktail glass.
5. Garnish with an orange slice and a maraschino cherry. Optionally, add a few dashes of Angostura bitters on top.

This recipe balances sweet, tart, and boozy flavors, making a refreshing and classic cocktail.