Orange-Glazed Sponge Cake

Directions

1. In a large bowl, beat egg yolks until slightly thickened. Gradually add 3/4 cup sugar and beat until thick and lemon-colored. Blend in orange juice and zest. Sift together flour and salt; add to batter. Beat until smooth. In another bowl, beat egg whites until soft peaks form. While beating, add the remaining sugar, 1 tablespoons at a time. Beat until stiff. Fold 1/4 of the egg whites into the batter; then fold in remaining whites. Spoon into an ungreased 10-in. tube pan, smoothing top. Bake at 350° for 40 minutes or until tester inserted in the center of the cake comes out clean. Invert pan over a narrow-neck bottle to cool.
2. Meanwhile, for glaze, combine water, chopped orange and sugar in a small saucepan. Bring to a boil. Cook until very thick and almost all the water has evaporated. Remove from the heat and blend in confectioners' sugar and butter. Run a knife between the pan and cake. Turn out onto a platter. Spread warm glaze over the top and sides of cake.