Sunshine Cake 

1 1/2 cups egg whites
Grated rind of 1 orange or lemon
1/2 tsp. salt
1 tsp. orange extract
1 tsp. cream of tartar
1 1/3 cups cake flour
1 1/3 cups sugar
2/3 cup egg yolk 

Beat whites until frothy; add salt and cream of tartar gradually, beating constantly until stiff, but not dry. Keep adding until all the sugar is used and mixture holds its shape when bowl is tilted. Blend in orange rind. Sift flour onto mixture gradually, carefully and gently fold in until well blended, after each addition. Beat egg yolks until thick and lemon colored and gradually fold into

First mixture. Pour into ungreased 10" tube pan and bake at 325 F. For 1 hour and 15 minutes. Invert on rack and cool before removing from pan. Dust sifted confectioners sugar through the holes in fancy paper doily placed on top of cake, then carefully remove doily.