Preheat the oven to 230C/210C Fan/Gas 8. Line a baking tray with baking parchment. Roll out the puff pastry on a lightly floured work surface to a rectangle measuring about 40x30cm/16x12in and ...

Seal the edge. Repeat with the remaining pastry and filling, then transfer to a tray join-side down, brush all over with the beaten egg and refrigerate, covered, for 30 minutes. Preheat the oven ...