Whip egg whites, gradually adding sugar until meringue forms peaks. Beat in the yolks and vanilla, then combine with the fruit mixture, which has been blended with the cornstarch. Place on greased and floured cookie sheet and bake at 325F for 30 minutes.
Grease and flour a cookie sheet. Mix the ingredients to form a paste that will spread. Place mixture evenly on pan and bake at 200F for 15 minutes. Grate both the pulp and the rinds of the lemon and oranges, removing only the seeds, or chop coarsely, and puree in blender. Combine all ingredients and cook over medium heat until mixture thickens. Cool, and then beat lightly with wooden spoon until mixture begins to take on a pearlized, or frosted, coloration. Spread on the cake and let set before slicing.