From “A Guide to Royal Success in Baking”, a cookbook written and distributed by Royal Baking Powder, in 1942.
Sunshine Cake
1¼ cups granulated sugar
6 tablespoons cold water
6 eggs
⅛ teaspoon salt
1 teaspoon vanilla extract
1 cup cake flour
1 teaspoon Royal Baking Powder
Cook sugar and water together to 238°F. or until the syrup spins a thread; remove from fire. Add salt to egg white and beat until stiff. Beat in hot syrup slowly; continue to beat until quite cool. Add flavoring. Beat egg yolks until thick; blend with egg white mixture. Sift together dry ingredients twice; add to egg mixture; blend carefully. Bake in large ungreased tube pan in moderate oven at 350°F. about 1 hour. Makes 1 nine-inch cake.
