I used 1/4 oz triple sec instead of the 1/3 oz simple syrup, to make it more sidecar-like and a bit less sweet. I think it’s great with the hint of orange. I also used ruby port because I didn’t have tawny, which gives it a lovely deep red hue. Overall quite a tasty dessert drink.
Surprisingly a lot less chocolate and a lot more port than you'd think. Even at 10ml of a 1:1 simple it was very sweet - I'd probably halve it if not remove it entirely next time.