1.
Preheat oven to 180 degrees C. Grease and flour a cake tin.
2.
In a medium mixing bowl beat the egg whites with an electric mixer on medium for about one minute or until just stiff.
3.
In a large mixing bowl beat the butter and sugar until light a fluffy.
4.
Add the egg yolks and vanilla essence. Mix well for about a minute.
5.
Add the sifted flour in two batches mixing well after each one.
6.
Pour in the water and milk mix until combined.
7.
Fold in the egg whites using a spatula.
8.
Pour the mixture into the cake tin and bake for 25-30 minutes or until a skewer inserted into the middle comes out clean. Cool for 5 minutes before serving.