The original Tuck recipe was an eye opener, after trying the main recipe above. Completely different! Due to the extra lemon. I think I prefer the Tuck version (I had to sub Tanqueray) which comes across as a riff on a Corpse Reviver #2 with chocolate in place of orange. The chocolate is gone as a dominant flavour note but is still a key part of the overall impact. Mmmm.