Bolo de laranja (Brazil orange cake)

5 egg yolks
8 T. orange juice
2 C. flour
2 C. sugar
1 t. baking powder
1/2 t. vanilla
5 beaten egg whites

Combine and mix egg yolks and orange juice. Sift together dry ingredients and add slowly to egg yolk mixture. Beat for 2 minutes. Add vanilla. Fold in beaten egg whites. Pour into well-greased 9" x 13" pan. Bake 25-30 minutes at 350 degrees. Serve with or without whipped cream.

Source: Holy Spirit Church Council of Catholic Women (location unclear), "Their Favorite Recipes" (revised edition, 1989); recipe by Margaret L. Radosevich.