| 1 | White part: sift ?cup cake flour and ?cup powdered sugar together three times. |
| 2 | Beat egg whites till frothy; add cream of tartar, vanilla, and salt. |
| 3 | Beat till soft peaks form. |
| 4 | Gradually beat in ?cup granulated sugar. |
| 5 | Sift a fourth of the flour mixture at a time over top; fold in. |
| 6 | yellow part: sift ?cup cake flour and baking powder together three times. |
| 7 | Beat yolks with juice and water until thick, 5 to 7 minutes; gradually beat in ?cup granulated sugar. |
| 8 | Sift a fourth of the flour mixture at a time over top; fold in. |
| 9 | alternately spoon yellow and white mixtures into an ungreased 9- or 10-inch tube pan. |
| 10 | Bake at 375 °F for 35 to 40 minutes. |
| 11 | Invert and cool. |
| 12 | Dust cake with powdered sugar. |
