Cloud Sponge Cake
["1 1/3 c. cake flour", "1/2 tsp. baking powder", "1/4 tsp. salt", "5 eggs at room temperature", "1/2 c. ice water", "1 1/2 c. fine sugar", "1/4 c. orange juice and 1 Tbsp. grated orange rind", "3/4 tsp. cream of tartar"]
["Stir together flour,", "baking powder and salt; set aside. In large bowl of", "mixer,", "beat", "egg", "yolks", "at high speed until thick and lemon-colored.\tGradually", "beat", "in", "water until pale and foamy.", "Gradually beat in sugar until completely dissolved, about 8 to 10 minutes.", "Beat in juice and orange rind.", "Fold in flour mixture in 3", "additions into yolk mixture; set aside.", "In small bowl of mixer,", "using", "clean beaters, beat egg whites and cream of tartar", "until", "stiff.", "Gently", "fold into batter.", "Pour mixture into a", "10-inch", "ungreased tube pan.", "Bake in preheated 325\u00b0 oven for about", "1", "hour\tor", "until", "cake springs back when lightly touched.", "Invert pan", "on neck of bottle and cool.", "When completely cooled, use", "thin", "bladed", "knife to loosen cake from pan."]
["cake flour", "baking powder", "salt", "eggs", "water", "sugar", "orange juice", "cream of tartar"]