For the sponge cake:
6 large eggs
1 cup sugar
1 cup flour
1/2 tsp salt
1 tsp vanilla
6 tbsps melted butter
In a bowl over simmering water, mix the eggs and sugar until the sugar is dissolved and the mixture is warm – do not boil.
Place bowl on an electric mixer and beat until light in color and tripled in volume. Remove
Sift the flour and salt into the egg mixture and carefully fold in, trying not to deflate the mixture.