SPONGE CAKE ROLY-POLY

3 eggs, the weight of 2 in fine wheatmeal, of 8 in castor sugar, some raspberry and currant jam. Mix the ingredients as directed in "Sponge Cake," line a large, square, flat baking tin with buttered paper, pour the mixture into it, and bake it in a fairly hot oven from 7 to 12 minutes, or until baked through. Have a sheet of white kitchen paper on the kitchen table, on which sprinkle some white sugar. Turn the cake out of the tin on to the paper, spread the cake with jam, and roll up. This should be done quickly, for if the cake is allowed to cool it will not roll.