Make shortcrust pastry with flour, cold butter, cold water, and salt
Chill the pastry
Roll out and line a 20–23cm tart tin
Bake at 180°C (160°C fan) for 15 minutes with weights, then 8-10 minutes without weights until lightly golden
Whisk together caster sugar, melted butter, eggs, orange marmalade, orange juice, lemon juice, lemon zest, orange zest, and flour or breadcrumbs
Pour filling into the pre-baked tart case
Bake for 20–25 minutes until edges are set with a slight wobble in the centre
Chill in the fridge to set completely
Optional: dust with icing sugar before serving
