Mock Angel Food Cake
["2 c. cake flour", "2 c. sugar", "1/4 tsp. salt", "7 egg whites", "1 tsp. cream of tartar", "3 tsp. baking powder", "1 c. boiling water", "1 tsp. vanilla"]
["Sift flour 5 times, then add sugar and salt.", "Beat egg whites with cream of tartar until about half stiff, then add baking powder.", "Beat until it stands in peaks.", "Now pour boiling water over flour and sugar and stir until well mixed.", "Add vanilla. Fold in egg whites until well blended.", "Bake in ungreased 9 x 13-inch pan in slow oven at 320\u00b0."]
["cake flour", "sugar", "salt", "egg whites", "cream of tartar", "baking powder", "boiling water", "vanilla"]