Magic Lemon Custard Cake

Ingredients

4 eggs, separated
1/2 cup sugar
1/2 cup icing sugar
115 mls oil
3 tbsps lemon juice
Zest of 1 large lemon
115g plain flour
480 mls milk

Method

Whisk the egg yolks and sugar, then add the oil, lemon juice, zest and flour. Gradually mix in the milk.
Whisk the egg whites until stiff, then fold them in. Pour into a lined tin and bake for 45 mins or up to an hour, until the top is cakey and the middle custard layer is just set.