My cousin made an unbelieveable chocolate cake over Christmas and as it's someone's birthday at work today I thought I'd give it a go myself. I can't remember the proper name for the cake, but we've dubbed it the Ridiculous Chocolate Cake (or Ridic Choc for short) because of the amount of chocolate in it. In fact, the recipe even comes with a health warning that you should limit how often you make it!
The cake's made in two parts - a kind of firm brownie base and a soft chocolate mousse topping. It's a bit of a labour of love, but the end result is well worth the effort.
The Ingredients
The ingredients. Except for the Coke and the toothpaste. Oh, and you need some icing sugar as well.
The Base
Melt some sugar, butter and a load of chocolate together in a bowl over simmering water. It's important to keep the mixture dry as the smallest amount of water will make it seize - even using a wooden spoon can cause problems as it may contain moisture that will leech out into the chocolate.

The melted result.

Mix in some icing sugar and some whisked eggs.

Bung it in the oven for half an hour, and then let it cool (but leave it in the tin). The result is a crispy outside with a soft inside, sort of like an inside-out Dime bar.
The Topping
Melt another load of chocolate over hot water for the topping.

Mix in some icing sugar, egg yolks and butter to make a smooth goo.

Whisk some egg whites until they form stiff peaks, then do the same with some cream in another bowl.

Fold the egg white and cream into the chocolate mixture. The air trapped in the egg white and cream forms the basis for the mousse. Pour this over the base and chill in the fridge overnight.
The Result
People dived in before I had a chance to take a proper picture - this was all that was left after about 2 minutes. The edges are a little rough as you're supposed to use a hot knife to separate it from the tin, but all I had was some plastic cutlery from the canteen.
I made some Creme Anglais (basically, runny custard) to go with it to try and break up the stickiness of the cake - you can see that in a tub on the right of the cake. So far it's all been a bit of a hit but I'll have to wait a while to make this again.