I've used a pineapple icing on this cake, but the creamsicle glaze gets the most raves.
Sunshine Cake
1 cup unbeaten egg whites (about 8)
¼ teaspoon salt
1 teaspoon cream of tartar
1½ cups granulated sugar
6 egg yolks
Zest from ½ an orange
1¼ cups cake flour
Orange Creamsicle Glaze
1 cup powdered sugar, sifted
⅓ cup heavy whipping cream
½ teaspoon vanilla extract
zest of 1 orange
Instructions
Sunshine Cake
In the bowl of a stand mixer fitted with a whisk attachment, or large bowl and hand mixer, beat egg whites and salt until foamy; add cream of tartar and beat until stiff peaks form.
Gently fold in the granulated sugar, then set aside.
In a clean bowl, beat egg yolks until thick and lemon-colored.
Gently fold ⅓ of the egg white mixture into the yolks and blend well, then add back in to the egg whites.
Add orange zest and flour, and gently fold until incorporated, until there are no streaks of flour left.
Bake at 325 degrees in an ungreased 9½-inche tube pan (angel food pan, bundt pan) for 40-60 minutes (depending on your oven - mine only took about 43 minutes).
Orange Creamsicle Glaze
Combine all ingredients in a bowl. Whisk until incorporated, adding more cream if you want it thinner. Drizzle over cake before serving. Makes enough glaze for the whole 9½-inch cake.