Never Fail Sponge Cake
["6 eggs, separated", "2/3 c. cold water", "1 c. sugar", "1 1/2 c. flour", "1/4 tsp. salt", "1 tsp. cream of tartar"]
["Separate eggs.", "Beat egg yolks 5 minutes.", "Add water and sugar, beating 4 minutes.", "Sift together flour and salt; stir into yolks.", "Beat egg whites frothy, add cream of tartar and beat until they hold peaks.", "Fold into yolk mixture.", "Bake at 350\u00b0 for about 1 hour in tube pan."]
["eggs", "cold water", "sugar", "flour", "salt", "cream of tartar"]