SPONGE CAKES AND THEIR PREPARATION
METHOD OF PROCEDURE
39. With the ingredients and utensils gathered and prepared, the mixing of the cake may be begun at once. The method of mixing depends entirely on the kind of cake that is being made, sponge cake involving a different procedure from butter cake. These methods should be thoroughly mastered, so that there will be no danger of confusing them and so that the recipe will not need to be referred to constantly during the mixing of the cake. When an ingredient that is not usually included in the ordinary butter or sponge cake is found in the recipe, the way in which this ingredient is added to the mixture should be carefully noted, so that no mistake will be made.
40. NATURE OF SPONGE CAKE.--A true sponge cake contains nothing besides eggs, sugar, flour, and flavoring material. The eggs, sugar, and flour are used in equal amounts, the eggs and sugar being about the same by weight or measure and the flour half as much by weight. For instance, a successful sponge cake can be made with a cupful each of eggs, sugar, and flour. To these ingredients the juice of 1/2 lemon is usually added, and sometimes the grated rind of the lemon is used also. The simple variation in sponge-cake mixtures is the addition of liquid, which is usually water, sometimes cold and sometimes hot. In the true sponge cake, eggs supply all the leavening, but it is possible to economize in the number of eggs by using leavening of some other kind, such as soda and cream of tartar or baking powder. The texture of a sponge cake in which leavening other than eggs is used is not so good as that of the true sponge cake, but if this leavening is used discreetly, it is possible to decrease the number of eggs somewhat without sacrificing too much in texture. However, it is useless to try to make a good sponge cake with fewer than three eggs, for the other ingredients--flour, sugar, leavening, and liquid--are not sufficient to produce a delicious cake.
41. COMBINING THE INGREDIENTS.--The ingredients required for a true sponge cake and the utensils used in making such a cake are shown in Fig. 3. As will be observed, both the utensils and the materials are so placed on the table in front of the one who is to make the cake that the work may be performed with the least amount of effort.
If the whole eggs are to be used, break them into the mixing bowl and beat them with a rotary egg beater, as shown in Fig. 4, until they are thick and lemon-colored. In case only the whites are to be used, beat them with an egg whip on a flat dish or in a large bowl until they are stiff. To the beaten egg, add the sugar a little at a time, as shown in Fig. 5, beating it into the egg with the rotary beater.
