The concept is pretty simple: pick what you want from a relatively small menu, and then they make it in their open kitchen in front of you in minutes.
I opted for the pondicherry vanilla ice cream, topped with hazelnut plus a bit of raspberry sauce on the side. Pretty tasty stuff and it's always a good thing when you can see and taste the vanilla!
Now that summer's coming (kind of), you could consider popping in if you're in the area - for the novelty if nothing else.
Closest Tube: Camden Town