I tried it right after a Penicillin, and it's almost as good. I cannot identify Montenegro, but it tastes crisper than Penicillin, and I love it. Anyway, as with Manhattan, I enjoy every riff of them. Penicillin is a winning formula, and searching for cocktails with ginger liqueur /syrup plus honey plus citric brings another excellent cocktail.
Love it. I used Duque de Alba brandy and Pierre Ferrand Curaçao. What I've enjoyed the most is that Curaçao shines here, compared to so many other cocktails where it gets obscured by other ingredients.