Sunshine Cake
["1 1/4 c. sugar", "1 c. pastry or soft wheat flour", "3/4 c. egg whites (from 6 to 7 eggs)", "3/4 tsp. cream of tartar", "1/2 tsp. salt", "1/2 c. egg yolks (4 to 5)", "1 tsp. vanilla or orange extract"]
["Sift both the sugar and flour before measuring.", "Sift the flour 4 times after measuring."]
["sugar", "pastry", "egg whites", "cream of tartar", "salt", "egg yolks", "vanilla"]