I went to Abeno for lunch, near the British Museum. It claims to be the only specialist okonomiyaki restaurant in Europe. Okonomiyaki is a Japanese omelette-y thing that is cooked in front of you on a hot-plate at the table. I had one with pork and kimchee (spicy Korean fermented cabbage), which was topped with dried bonito flakes. It was nice, though not as good as the rice dish I ordered – rice with green tea poured over it and dressed with nori. Yum. And then I had that flaked ice dessert the Japanese do – in maccha flavour (i.e. the powdered tea used for the tea ceremony).
I recommend it if you’re going to the BM.