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Add the milk and butter in a large saucepan and place over a medium heat until butter has melted, don't bring to the boil though.
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Remove from heat and sift in the cocoa powder, whisk until all combined, the more you do this the more the choc flavour will enhance.
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Add the coffee and yogurt, beat until well mixed in.
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Beat the sugar and eggs into the butter and cocoa mix until thoroughly combined together.
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Sift in the flour, baking powder and salt, whisk again to bring together.
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Grease and line 2x 8" cake tins, bake in oven preheated to gas mark 3/160c for 35-40 mins until you get a brownie type consistency, you want a fudgy texture for the cake not a "fully baked" cake batter.
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Remove from the oven and leave to cool for 5 mins then turn out. Let go them completely cold before continuing with the buttercream.
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For the ganache/buttercream sift the cocoa powder and icing sugar into a large bowl and add a pinch of salt.
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Soften the butter, I warmed in microwave for 30 seconds until a more spreadable consistency, or you could leave at room temp for a few hours. Add to the icing sugar but don't mix yet.
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Heat the cream until warm enough to melt the butter but don't let it boil - you can do this either in microwave or in a pan. Pour into the other ingredients and mix with an electric mixer.
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Cover and place in fridge for at least an hour to firm up, it will go very thick once the butter has firmed.
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When ready to ice the cake, use an electric whisk to whip the buttercream to a slightly softer state and go spreadable and shiny.
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Place buttercream between the two layers of cake and slap all over the outside and sides. A traditional devils food cake is fairly roughly decorated so you don't need to be really neat with it - a more rough coating adds to the style! Slice and serve!

