Angel Food Cake
["1 c. sifted flour", "1 1/2 c. sugar", "1 1/2 c. egg whites", "1 1/2 tsp. cream of tartar", "3/4 tsp. salt", "1 tsp. vanilla", "1/2 tsp. lemon extract"]
["Sift half of the sugar with the flour 4 times. Beat egg whites to a foam. Add cream of tartar and salt; beat until it holds up in peaks. Add remainder of sugar, a little at a time, beating it in. Add flavoring. Fold in the flour mixture slowly, using a down and up motion. Pour into an ungreased 10-inch tube pan. Bake 50 to 60 minutes at 325\u00b0."]
["flour", "sugar", "egg whites", "cream of tartar", "salt", "vanilla", "lemon extract"]