Buttercream Filling is a traditional British recipe for a classic milk, butter, egg yolk and sugar cake filling flavoured with coffee. The full recipe is presented here and I hope you enjoy this classic British version of: Buttercream Filling.
Combine the milk and sugar in a pan. Heat until the sugar dissolves then take of the heat and pour over the egg yolk in a bowl. Whisk to combine then return to the pan and heat to thicken (but do not allow to boil) and take off the heat. Cream the butter in a bowl then work in the custard when cool and flavour with the coffee essence.
This can be used to both sandwich cake halves together and to decorate the cake.
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