200g dark chocolate (55% cocoa)
200g salted butter
250g sugar
5 eggs
1 tbsp flour

Preheat the oven to 170°C. In a saucepan, melt the butter and chocolate on low heat. Mix together and remove from the heat. Add the sugar and allow to cool slightly. Then add the eggs, one by one, stirring well each time. Finally add the flour and combine until smooth.

Pour the mixture into a lined square metal tin and bake for 25 to 30 minutes, when ready a knife should just come out clean. Leave to cool down for at least two hours. It will taste even better the next day.