This one was "invented" when Gary Regan asked a bartender for an Oriental cocktail, which has as a base spirit rye whiskey, and the bartender used irish whiskey instead. Gary told the bartender " The mistake is the portal of discovery" quoting James Joyce and so...this new cocktail was born
1 1/2 ounces Irish whiskey
3/4 ounce sweet vermouth
3/4 ounce triple sec
1/2 ounce fresh lime juice