Pre-heat waffle maker.
In a bowl, combine sifted flour, baking powder and salt.
Mix in egg yolk, milk, water, melted butter and vanilla.
Stir mixture until smooth.
In a separate bowl, combine egg white and caster sugar, beat together
until soft peaks
form and sugar is dissolved.
Fold the egg white and sugar mixture into the main mixture.
Spoon 1-2 rounded tablespoon of mixture into each waffle mould.
Close lid.
Cook for about 2- 3 minutes.
Allow waffles to cool slightly before giving to children.