So somebody brought in a box of Lindt chocolates on a public table at work, and I tried out one.
The things said Batons Williams on it and happened to be liquor-filled sticks of dark chocolate with a lining of crystalized sugar on the inside. Very yummy.
Problem is, I tried googling for "Batons Williams" and almost nothing came up.
The only thing I could find in english was this site which mentioned that they're only available in Switzerland.
Only in Switzerland, eh? Bummer. Wonder if there's any more...