Combine all ingredients in a shaker with ice and shake until well chilled.
2.
Strain into a chilled coupe glass.
Notes
The original recipe calls for ⅓ rye whiskey, ⅓ French vermouth, ⅙ lemon juice, and ⅙ grenadine. Bartender Gary Regan didn't care for those ratios so he updated the recipe to what you see here.