Cold Water Sponge Cake
["4 eggs", "1 1/2 c. sugar", "1 1/2 c. flour", "1 tsp. baking powder", "1/2 c. warm water", "1 tsp. vanilla"]
["Beat eggs well.", "Add sugar and beat.", "Mix flour and baking powder.", "Add alternately with 1/2 cup warm water and vanilla. Beat only until mixed well.", "Bake in greased and floured pans (9 x 13-inch or two 9-inch) at 350\u00b0 for 30 minutes."]
["eggs", "sugar", "flour", "baking powder", "warm water", "vanilla"]