Mixology contest!

I need a drink called a Bête Noire. Our local absinthe bar tried to slip me a Boulevardier in disguise, but I am wise to their trickery. (But now I love Boulevardiers, so that's a plus.) I feel this drink should be dark, bitter, and dangerous, but am otherwise open to just about anything. Whoever designs the drink I like most will win a place in the acknowledgements of a book, and probably a better prize as well, when I think of something appropriate.

I will test all serious suggestions and report back.

A most specially greedy, strong and wicked worm...

Late to the party as usual, I have just discovered Sherlock. Sweet Fishes, and I thought Benedict Cumberbatch was pretty in Tinker Tailor. I now want him to play every dragon in the world--including Morkeleb. I also have very high hopes for all Smaug and Bilbo's conversations. As well I bloody should, since those were always my favorite scenes.