Terrible photo, but you get the idea. It is smoked cheddar with charcoal! A big hit with me; I love anything smoked (including smoked vodka, despite the unease engendered by anything smoked reminding me slightly of cheese), and this has a rich and intense smokiness.
Also an inedible and almost invisible rind of black wax, which I discovered quite late in the game.
Cheese news 2: I stayed with friends at the weekend, and was taught to make gougères. From now on, I plan to make them at every opportunity.