Heat oven to 200°C (180°C fan).
Line a 23 cm tart tin or plate ( Irish way☘️) with the pastry
Mix the apples with the sugar, cinnamon, cornflour, vanilla, and lemon juice.
Fold in the frozen blackberries gently—they’ll thaw as the tart bakes.
Spoon the filling into the pastry case.
Top with more pastry
Cut away any overlap edge & seal with fork.
Brush the pastry with egg.
Bake for 40–50 minutes until the pastry is golden and the fruit is bubbling.
