Flavorful One-Dish Tuna and Onion Puff Pastry Pie Meal

raisins before adding them to the filling because this softens their texture and helps them blend better with the other ingredients.
Prick the puff pastry with a fork before baking to allow steam to escape and help create a more even, crisp crust.
Leave a small border around the edges when adding the filling so the pastry sheets can seal properly and prevent the filling from leaking during baking.
Brush the pastry with egg and milk before baking to achieve a shiny, golden surface with an appetizing finish.
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