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Method
step 1
Heat the oven to 160c, butter and line a 20cm cake tin.
step 2
Using an electric whisk, beat together butter and light muscovado sugar in a large bowl until fluffy.
step 3
Measure out plain flour and self-raising flour, beat in 5 eggs one at a time, adding 1 or 2 tbsp flour if the mixture starts to split
step 4
Pour 300g melted and slightly cooled dark chocolate into the mixture, beating as you do so. Fold in the rest of the flour.
step 5
Spoon into the tin and bake for 1 hour 30 minutes, the cake should be risen with a crust on top. Cool and then take out of the tin. Split the cake horizontally.
step 6
To make the icing, gently melt together dark chocolate with double cream. Cool until thickened slightly. Fill the cake with icing, then spread the rest over the outside.