I thought this was great - cognac really pulls out the chocolate and vermouth adds some complexity - but SWMBO (She Who Must Be Obeyed) said it tasted like a "Frankenstein" cocktail.
This was great. Not very sweet and perfect for after-dinner. Love the chocolate powder rim as it is like the salt rim on a margarita. Kept moving the glass to a new space with the new powder. Very interesting blend of flavours which make a great sipper.
I used regular vodka and some drops of vanilla essence which worked very well and lifts the chocolate taste of the cocktail It would be interesting what a professional uses to fix the chocolate rim Sugar syrup tastes very good but tends to make some ugly "chocolate tears" on the glas.
Rich (2:1) sugar applied via a sponge works but my go-to is orange juice. Cut the corner from a whole orange. (The depth of your cut will determine how deep the chocolate powder is on the rim.) Upend your glass and run the rim around the cut orange. (The photo above is a very old one - back when my preference was sugar syrup via a sponge.)