In a Bowl add flour and mix well then remove 1 tbsp from it and add 1 tbsp cornflour ,salt and sift well.
In a seperate bowl add egg yolks ,sugar ,vanilla essence and beat well till creamy then add in the warm milk,melted butter ,sifted flour and mix well and keep aside.
In a seperate clean bowl beat the egg white with vinegar and sugar till soft peaks are formed then add slowly to the yolk mixture by cut and fold method.
Add the batter to the greased baking tin and keep it on another tray filled with water and bake @ 180 for 45-50 min until toothpick comes out clean..
