Beat the yolks of four eggs together with two cups of fine powdered sugar. Stir in gradually one cup of sifted flour and the whites of four eggs beaten to a stiff froth, then a cup of sifted flour in which two teaspoonfuls of baking powder have been stirred, and, lastly, a scant teacupful of boiling water, stirred in a little at a time. Flavor, add salt and, however thin the mixture may seem, do not add any more flour. Bake in shallow tins.
The Whitehouse Cookbook, by Mrs. F.L. Gillette (Year 1887)