Preheat the oven to 200 degrees celsius (fan-forced).
Heat 1 tbs of olive oil in a large frying pan over high heat.Add the onion, garlic and beef mince and cook for 3-4 minutes or until browned (use a spoon to break up the chunks of beef). Sprinkle over the plain flour and stir.
Add the tomato paste, Worcestershire sauce, caster sugar and liquid beef stock. Mix to combine and then cook, stirring, for 5-10 minutes or until the mixture has thickened.
Season with salt and pepper and stir through the frozen peas.
Pour the beef filling into a lightly greased medium baking dish.
Spread the grated cheese over the top.
Cover with the puff pastry sheets, sealing the edges. Cut a few slits in the pastry to allow the steam to escape.
Brush with the lightly whisked egg and sprinkle with sesame seeds (optional).
Bake in the oven for 35 minutes or until the filling is piping hot and the pastry is flaky and golden.
Notes
RECIPE NOTES & TIPS
Break the beef mince up with a spoon as it browns - to ensure no lumps and even cooking.
Make sure your puff pastry is defrosted fully before using.
A beaten egg - creates a wonderfully golden and shiny pastry top.
Serving ideas - this pie is delicious on its own, but you could also serve it with some mashed potato, crispy wedges, and some steamed broccoli, green beans, carrots or cauliflower on the side.
Storage - store any leftovers in the fridge for up to 2 days.
Freeze any leftovers for up to 3 months. Allow to defrost in the fridge overnight before reheating.
How to reheat - reheat in the microwave or oven until piping hot in the centre.