If you have lots of time, crush the cardamom and allow to infuse in the hot coffee for 1-2 minutes.
This is a great alternative to a Negroni if you keep Kosher. I didn't realise someone had already invented it, but I often ask for these.
It would be great if, on the website, I could filter recipes by edition (or even date added/updated) - I also recently purchased the 16th edition.
Are you certain that this is based upon brandy? I have seen (a copy of) correspondence from the manufacturer that grapes/grape derivatives are not in the ingredients, and is therefore not based on brandy.
I first encountered this over 20 years ago, in Australia. They used a dash of Blue Curacao to deepen the green, and it rounded off the flavour quite pleasantly. I always add the blue curacao at the end and stir in.