The Filibuster is an autumn cocktail that was created by Erik Adkins at The Slanted Door in San Francisco, California. It is a simple variation of the Whiskey Sour that still uses a spicy whiskey for the base, lemon for balance, and egg white for texture just like the classic, but it swaps out the simple syrup for maple syrup to add a fall-inspired twist.
Add whiskey, lemon juice, maple syrup, and egg white to a shaker.
Fill shaker with cubed ice.
Shake for 10-20 seconds.
Using tongs, remove ice from shaker.
Dry shake for 5-10 more seconds to emulsify egg.
Using a Hawthorne strainer, strain into a coupe glass.
Top with bitters.
Drag a toothpick through bitters to create a garland of hearts.