Method

• 1.
  Sift the flour and icing sugar into a large bowl. Use your fingertips to rub the butter into the flour mixture until it resembles fine breadcrumbs.
• 2.
  Add the water and use a round-bladed knife to stir until a dough forms. Use your hands to bring the dough together in the bowl. Turn onto a sheet of non-stick baking paper and roll out to a 5mm-thick disc. Use the pastry to line a 23cm (base measurement) pie dish. Trim excess pastry. Cover the pastry with baking paper. Place in the fridge for 30 minutes to rest.
• 3.
  Preheat oven to 180°C. Fill the lined dish with pastry weights or rice. Bake in oven for 15 minutes. Remove the paper and pastry weights or rice. Bake for a further 15-20 minutes or until crisp and golden. Set aside to cool completely.
• 4.
  Meanwhile, to make the lemon filling, combine the cornflour, water, lemon juice and half the sugar in a saucepan. Use a balloon whisk to stir over medium heat for 4 minutes or until the mixture boils and thickens. Continue to cook, stirring constantly, for a further 1 minute. Remove from heat. Whisk in butter and egg yolks. Transfer to a bowl. Cover with plastic wrap and place in the fridge for 3 hours or until cooled completely.
• 5.
  Preheat oven to 190°C. Use an electric beater to beat the egg whites in a clean, dry bowl until soft peaks form. Gradually add the remaining sugar, 1 tablespoonful at a time until the mixture is thick and glossy.
• 6.
  Spread the filling over the base of the pastry case. Spoon over the meringue mixture and spread to the edge of the pastry. Use the back of a spoon to create peaks. Bake in oven for 5 minutes or until the meringue peaks are light golden. Set aside to cool completely. Serve.