Preheat the oven to 425°F (220°C). Generously grease an 8-inch pie with butter.
1 tbsp butter
In a large skillet over medium high heat, add the olive oil, followed by the diced onions. Sauté them until slightly softened for 2-3 minutes.
1 tbsp olive oil, 1 yellow onion
Increase the heat to high and add ground beef and cook until browned. Add the minced garlic towards the end and cook until fragrant. Season with salt and black pepper.
Deglaze the large frying pan with red wine or beef stock and reduce the liquid.
1/2 cup red wine
Reduce to medium heat and stir in diced tomatoes, tomato paste, fresh rosemary, thyme, soy sauce, and the bay leaf. Simmer on low heat for 10 minutes until the mixture thickens into a very thick gravy, similar to a rich bolognese sauce. Season to taste with salt and pepper, remove bay leaf.
Roll out the pie dough and line a pie dish with pie pastry, then spoon the lamb mixture into the dish. Top with grated cheese.
1/2 cup cheddar cheese, 1 shortcrust pastry sheet
Place a sheet of puff pastry over the lamb filling and crimp the edges to seal.
1 puff pastry sheet
Add an egg yolk wash with a pastry brush for a golden finish. Add the sesame seeds.
1 egg, 1 tbsp sesame seeds
Place the pie on a baking sheet and bake for 20-25 minutes, or until the pastry is golden brown.
Video
Notes
Thicken the sauce: If the filling too sloppy, cook it for longer or mix 2 tsp of cornflour in 1/4 cup of the gravy and stir it into the filling to help bind it.Seal pastry: Ensure the edges of the pastry are sealed tightly to prevent the filling from leaking during baking. Add a baking sheet underneath the pie dish to catch any leaks.Let it rest: Allow the pie to cool for 20 minutes before serving to allow the filling to set slightly.Storage: Meat pies can be stored in an airtight container in the refrigerator for up to 3-4 days. For longer storage, wrap leftover pie slices tightly in layers of foil and store them in an airtight container before freezing. Reheat in the oven until warmed through.