Egg Yolk Sponge Cake
In a large mixing bowl, combine egg yolks, sugar, and water; beat until light and foamy.
Gently fold in flour. Pour into prepared cake pan; smooth top.
Bake for 25 minutes or until center of cake springs back when lightly touched.
Cool in cake pan for 10 minutes. Remove from pan; cool completely on a wire rack. Fill and frost and desired.