Dave Stolz's recipe (which is 2 oz Scotch and 1/2 oz Drambuie) calls for including a wide lemon peel and one dash of Angostura bitters. Muddle the lemon zest, Drambuie, and bitters to express the lemon oil. Add a large ice chunk or two to three ice cubes then add the Scotch. Stir briskly to blend and chill.
I like a slightly different ratio of 2 oz blended scotch and 1/2 oz Drambue. Combine in old fashioned glass, add ice, stir.