Donn Beach’s original recipe, circa 1934, found in a waiter’s notebook dated 1937 and marked “old.” 1 ½ oz. Mount Gay Gold Rum 1 ½ oz. Appleton Extra Rum 1 oz. Lemon Hart 151 Rum ¾ oz. lime juice ½ oz. Don’s Mix ½ oz. Falernum Dash Angostura Bitters 1/8…