Ingredients

1/4 lb butter

1/4 lb castor sugar

3 eggs

1/2 lb plain flour

1 level teaspoon cream of tartar

pinch salt

1/4 teaspoon bicarbonate of soda

1/2 cup milk

1 dessertspoon cocoa dissolved in a little boiling water

Filling

1 tablespoon butter

1 dessertspoon cocoa

4 tablespoons icing sugar

vanilla essence

1 teaspoon milk

Icing

1/2 lb sugar

1 dessertspoon cocoa

1 1/2 tablespoon boiling water

vanilla essence

Method

Cream butter and sugar, add well beaten eggs, then sifted flour, cream of tartar, bicarbonate of soda, and salt. Mix milk with dissolved cocoa and add to cake. Bake in greased sandwich tins in a moderate oven for 20 minutes. Mix filling with listed ingredients and fill cake when cool. Make icing with listed ingredients, cover cake and allow to set.

Mashed potatoes too runny? Add a little dried potato powder as required.