Ruth's yummy sponge cake recipe

After much encouragement our hygienist Ruth has finally been convinced to share her special sponge cake recipe! Below is the ingredients and method. Happy baking!

Ingredients:
4 large eggs separated
1 cup castor sugar
1 cup wheaten cornflour
1 teaspoon cream of tartar
1/2 teaspoon bicarb soda
1 tablespoon butter melted

Method:
1. Sift cornflour, cream of tartar and bicarb soda twice
2. Beat egg whites until soft peaks form (With a pinch of salt)
3. Add eggs yolks one at a time
4. Add castor sugar gradually beat until thick and pale in colour
5. Fold through sifted dry ingredients
6. Fold through melted butter
7. Bake 180°C for 20 minutes (or until cake springs back when touch on top)

(Should not take more than 7 minutes to mix all ingredients together)