2 oz Rittenhouse Bonded Rye Whiskey
¾ oz fresh lime juice
½ oz Bénédictine D.O.M.
2 dashes Angostura bitters

Shake with ice an strain into a chilled coupe. David Wondrich unearthed this sophisticated sour collected by Broadway press agent Murdock Pemberton in a 1937 issue of Esquire.

The PDT Cocktail Book