This is very much a Swedish thing. It's something we call "kladdkaka" which literally translates to "sticky cake". It's a sort of chocolate cake without baking powder, and with a gooey middle. Best enjoyed with whipped cream, or after a night in the fridge. Or both. Or, and this is my favourite, when you really really shouldn't.
150 g butter
450 ml sugar
225 ml flour
90 ml cacao powder
A bit of salt and a bit of vanilla sugar
I use one of these cake pans, because with the removable sides I can wedge a baking paper in there and it won't stick.
This is what it looks like when it's done. Mmmm. Delicious.
-- CC0 Björn Wärmedal