Orange Feather Sponge Cake
["5 eggs", "2 c. sugar", "1 tsp. vanilla", "3/4 c. cold water", "1/4 c. orange juice", "2 1/4 c. cake flour", "2 tsp. baking powder"]
["Cream 4 yolks with sugar.", "Add orange juice, flour and baking powder.", "Add water and vanilla.", "Fold in 5 beaten egg whites. Line tube pan with wax paper.", "Bake at 350\u00b0 for 1 hour.", "Turn pan upside down until cool."]
["eggs", "sugar", "vanilla", "cold water", "orange juice", "cake flour", "baking powder"]