Cinnamon Sponge

Mix together 1 cupful of sugar, 3 eggs, 1 cupful flour, 3 dessertspoonfuls cocoa, 1 teaspoonful cream of tartar, ½ teaspoonful carbonate soda, a teaspoonful ground cinnamon, and, lastly, 2 tablespoonfuls butter in a cupful hot water. This can be baked as a cake or in a sandwich tin, and filled with cream filling.