Ingredients
150g unsalted butter, chopped
1/2 teaspoon vanilla extract
1/3 cup caster sugar
1 tablespoon cornflour
1 1/3 cups plain flour
Icing sugar mixture, to serve
Lemon topping
4 eggs
1 teaspoon finely grated lemon rind
1/3 cup plain flour
1 1/3 cups caster sugar
2/3 cup lemon juice