Preheat oven to 180 C. Line a square tin with baking paper
Combine butter, sugar and butter with a pastry blender or your hands to create a fine breadcrumb look. Press crumbs evenly into prepared tin.
Bake for 15 mins until golden. Remove and reduce oven to 140 C
To make Filling
Whisk eggs and sugar until very pale and thick. This is easiest with a stand mixer with whisk attachment as it can 5-10 mins. This creates the meringue like topping
Fold in lemon juice, zest and flour. Carefully to not deflate the eggs.
Pour over crust and bake for 40 minutes or until set
Cool completely before cutting and dust with icing and lemon curd
Notes
Inspired by a recipe of Julie Le Clerc in Simple Cafe Food