Jeffrey Morgenthaler, bartender at Clyde Common and Pépé Le Moko in Portland, Oregon, turned this classic into a creamy, frothy Grasshopper Shake: Omit the half-and-half, add ½ cup vanilla ice cream, and process in a blender with 1 cup crushed ice.
Fill a cocktail shaker with ice cubes. Add:
Shake until well chilled, about 12 seconds. Strain into a chilled cocktail glass.