Follow these straightforward instructions to create a delicious Aberdeen Beef Pie:

1. Preheat the Oven: Set your oven to 400°F (200°C).
2. Sear the Beef: In a large pot, heat the olive oil over medium-high heat. Add the beef cubes and sear them until browned on all sides. Remove the beef and set it aside.
3. Cook the Vegetables: In the same pot, add the chopped onion and carrots. Cook for about 5 minutes until soft. Add the garlic and cook for an additional minute.
4. Add Flour: Sprinkle the flour over the vegetables, stirring well to coat.
5. Incorporate Stock: Gradually pour in the beef stock while stirring. This will help to prevent lumps.
6. Season the Mixture: Stir in the Worcestershire sauce, thyme, salt, and pepper. Return the beef to the pot.
7. Simmer: Allow the mixture to simmer for 30 minutes, letting the flavors meld together and the sauce thicken.
8. Stir in Parsley: If desired, add fresh parsley just before removing from heat for a bright flavor boost.
9. Prepare for Baking: Pour the beef mixture into a pie dish and let it cool for a few minutes.
10. Cover with Pastry: Roll out the puff pastry on a lightly floured surface and cut it to fit your pie dish. Place it over the beef filling, trimming any excess.
11. Seal the Pie: Press down the edges to seal and make a few slits in the top for steam to escape.
12. Egg Wash: Brush the pastry with the beaten egg for a golden finish.
13. Bake: Place the pie in the preheated oven and bake for 25-30 minutes or until the pastry is golden brown.
14. Cool Before Serving: Allow the pie to cool for 10-15 minutes before serving.

These simple steps guide you through creating a hearty Aberdeen Beef Pie that is sure to impress.