The combination of bitter orange and sweet fruit in marmalade really brings this Glenlivet 15YO, with its rounded character and candied peel hints, to life. The ruby port brings a gorgeous gemstone colour too.
Place all ingredients in a cocktail shaker, including the marmalade. Shake hard and strain into a whisky tumbler filled with cubed ice. Garnish with thin strips of orange zest similar to the ones found in marmalade.