A spirituous aperitivo-style cocktail, or an after-dinner sipper, which can be made with numerous different sweet vermouths or indeed a vermouth amaro...
I made this with a 2:1:1 ratio (my preferred ratio for Negronis or Boulevardiers). Used Cocchi Vermouth di Torino as I didn't have the amaro. To bring some of the tasty bitter to the party that would otherwise be missing, I added a tsp of China China. Also, Berto Extra Secco in place of the Martini Extra Dry. And Monkey Shoulder in place of Dewar's b/c it's the only blended scotch I had on hand.
Though off-spec, this is a cocktail I expect to make again (hopefully w/ Dewar's next time?).