Preheat oven to 325F. Spray an 8 by 8 baking dish with bakers spray. Be sure to use an 8 by 8 pan to get the layered results
Beat the egg yolks, sugar, vanilla and salt until pale in color and fluffy
Add the lemon juice and zest and beat in
Add and beat in the melted butter
Add the flour in 2 additions, stirring it in until blended
Add the warm milk to the mixture and combine until blended. Batter will be very thin
Beat egg whites with cream of tarter until they form stiff peaks
Gently but completely fold egg whites into batter. It will still be thin
Pour mixture into prepared pan and bake about 40 to 50 minutes until golden on top and firm to touch. Mine takes 45 minutes in my oven
Cool completely before carefully running a thin knife around edges and removing from pan
Invert onto confectioner's sugar dusted kitchen towel
Carefully turn over onto serving plate
Dust with sweetened cocoa powder, cover and chill at least 6 hours
Cut into sqares
Serve with whipped cream and fresh berries
