How to make sponge cake

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  1.Put the butter into a milk pan and cook over low heat until it bubbles

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  2. Remove the pot from the heat and add flour, Scald with salt and mix into a paste

• 3.Add milk and stir evenly, then add egg yolk and stir evenly.Set aside the mixed cake.
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  4. Add sugar to cornstarch and stir evenly.Add egg whites in three batches and beat

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  5. Add the beaten egg whites to the pre-mixed cake lake in three batches and mix well

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  6. Put the mixed cake batter into an eight-inch mold and shake it twice Down.Place in preheated oven.First bake at 150 degrees for 25 minutes, then bake at 175 degrees for 25 minutes.