I finished the fifth tankouban of Kuroshitsuji and it made me happy. Talking with aionwatha, we realised that making curry is a huge deal and a big test of skill in Japan. Growing up in London, curry was a way a life. I can choose spices, herbs and things that will sweeten it appropriately with no trouble. Lime, yuzu, mint -- I can get creative with little trouble.
Having said that, I've NO idea if the solution Sebastian came up with -- chocolate -- would actually work. I... kind of want to try it, although my gut feeling is that it would be a total failure. Having said that, the manga is completely correct that good curry is made with a blend of handpicked spices rather than curry powder or, in the case of Japan, a curry cube.
Anyway, the highlight of the story for me was when Queen Victoria shows up on a horse with John Brown as her beautiful manservant. When she broke down and said how much she wanted to eat the curry with Albert, he comforted her with an Albert handpuppet. And put on voices for her. *dead*
There's also a fantastic two page spread where Sebastian shoots Agni from across the room with a cork and then catches it while maintaining his previous levels of politeness. In fact, the whole sequence leading up to that was funny. I would've liked to have seen more awesomeness from Sebastian, but then I forget that the ability to make Indian-style curry is generally perceived as awesome. Heh.
I saw a big advert featuring Ciel and Sebastian in Shinjuku yesterday, advertising a Gothic Lolita fashion collaboration or something (more info here). Based on what I saw of the fans at Comiket, the fandom seems to mostly go for Union Jack patterns and Victoriana. I know, I know -- I was as surprised as you were.