Rusty Nail
A rusty nail is a cocktail made by mixing Scotch whisky with Drambuie in a 1:1 to 2:1 ratio. A rusty nail is most commonly served on the rocks in an old-fashioned glass , although it can also be served "up" in a stemmed glass. Its origin goes back to the 1937 British Industries Fair, but it did not become popular until the 1950s endorsement by New York's 21 Club and its recognition by popular culture as the go-to cocktail of the Rat Pack a decade later. Variations of the drink can be made using any aged spirit with the Drambuie (its one essential ingredient), although using blended Scotch whisky in a 1 to 1 or 2 to 1 ratio is traditional. The addition of additional Drambuie tends to sweeten the cocktail. The cocktail can be garnished with a twist of citrus, usually orange, that will enhance the acidity and flavor. Other variations include:
Source: Wikipedia