Mix the prepared apples and blackberries in a bowl with the lemon juice and rind, sugar and cordial.
Divide between 12 individual pie or other ovenproof dishes.
Cut 6 x 5-6" discs from each pastry sheet. Brush dish rims with water and top each with the pastry discs, pressing edges firmly and fluting if desired.
Brush tops with water or milk and make a small hole in centre of each. If desired use pastry trimmings for decorations. Brush again and then scatter with caster sugar. Bake for approx. 15 minutes until pastry is golden brown.