Excellent if a bit enhanced. Firstly, I tried according to the specs (I used 20 ml Danish Stauning Rye whisky and 25 ml Nikka Whisky from the barrel, and 1 drop of Bob's orange & mandarin bitter, since I had no oranges) and found it a bit bland.
Then I added another 5 ml Cointreau and 1 more dash Angostura. Now it is really to my liking, kind of complex Old Fashioned.
Then I added another 5 ml Cointreau and 1 more dash Angostura. Now it is really to my liking, kind of complex Old Fashioned.