In a mixing bowl, mix with an electric mixer on high, castor sugar and egg yolks until creamy.
Add vanilla essence and mix. Add a little bit of water to the mixture.
In a different mixing bowl, sift the flour, baking powder and salt.
Add to the sugar and egg mixture and mix well.
Beat the egg whites until stiff peaks.Fold the egg whites into the batter, adding the rest of the cold water.
Fold until just incorporated. Pour batter into pan and bake for 20 min at 180 degrees Celsius.
When it’s ready to come out the oven, prepare a kitchen cloth by sprinkling a layer of castor sugar.
Tip the swiss roll face first onto the cloth.
Roll quickly to set form.
Unroll when it is still warm to add your filling of cooked condensed milk – the caramel. Or any other filling you like.
Roll again and cut in desirable pieces.