Preheat oven to 200 degrees fan forced and arrange rack into middle of oven
Place tart tin (see notes on size of tin recommended) onto a baking tray (no need to grease it, but it is important to bake it on a tray to catch any juices that may - or may not - come out of the pie)
Remove the pastry pieces from the fridge
Flour your bench well and starting with the 480g pastry portion roll the dough from the centre out, rotating a ¼ turn as you go, and flouring your bench as needed to prevent sticking, until you get a round big enough to fit the base of your tin (to confirm the size, place the tart tin on top of the pastry round to ensure you have enough pastry to line the sides of the tart tin with a very slight overhang)
Use your rolling pin to lift the pastry into the tart tin, lifting the pastry edges to allow you to gently press the pastry into the edges of the base so that the pastry is not being “stretched” into position
Use a knife or kitchen scissors to remove excess pastry from the edges leaving a 1 cm overhang so that you can stick the top pastry sheet to the base to trim before baking
Combine the scrapes into a single piece, and place on top of the second portion of dough rolling it out large enough to cover the top of the pie
Get a small container of water ready to help seal the pastry edges together
Pour the filling into the base
Before covering the pie, use your finger to dip into the water and run your wet finger over the edge of the pastry sitting in the base
Use your rolling pin to lift the top pastry piece and place it over the filling
Use your fingers to gently press the edges of the pastry together, rotating as you go and pressing down on the edges to cut through the two layers of pastry, securing the two edges together and creating a nice neat edge
Use a ruler to guide you cutting five lines across the top of the pie to allow steam to escape during baking (to make them evenly spaced, cut the middle line first, then do two either side of that)
Brush top of pie with cream, then sprinkle with Nigella seeds, if using, sea salt flakes and cracked pepper
Place pie in oven and bake for 15 minutes, reduce temperature to 180 degrees fan forced and continue baking for 45 to 55 minutes, until the top is a deep golden colour (it bakes for an extra 55 minutes in my oven)
Remove from oven and allow to rest for at least 15 minutes before cutting and serving
Serve with a lovely big garden salad, and lemon yoghurt sauce