Sponge Cake
["4 eggs", "2 c. sugar", "1/2 tsp. salt", "2 tsp. vanilla", "2 Tbsp. butter, melted", "1 c. boiling hot milk", "2 c. flour", "2 tsp. baking powder"]
["Grease and flour 9 x 13-inch pan.", "Beat eggs until very light. Beat in sugar, salt and vanilla.", "Heat butter in hot milk and beat in the mixture.", "Sift together flour and baking powder and add to cake batter and beat very quickly.", "Immediately pour into pan.", "Bake at 350\u00b0 for 25 to 35 minutes."]
["eggs", "sugar", "salt", "vanilla", "butter", "boiling hot milk", "flour", "baking powder"]