METHOD
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prepare the dough
Add all-purpose flour, sugar, baking powder, and a pinch of salt to a large bowl or food processor. Cut the cold butter into small cubes and add to the bowl. Rub the mixture between your hands and fingers until a sand-like mixture forms. Feel free to use a food processor for this part. Add the sour cream, egg, vanilla paste, and freshly grated lemon zest. Using your hand, knead into a dough. Cover the bowl with clingfilm and place in the fridge for 30 - 60 minutes for the dough to harden slightly.
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prepare the apples
While the dough is resting, make the apple filling. Peel the apples and remove the kernel. Grate the apples into a bowl and add sugar and cinnamon powder. Place a large pan over medium heat. Add the apple mixture and cook for 8 - 10 minutes while stirring regularly. Transfer the apples to a large plate and bring to room temperature.
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preparation
Grease a 25 cm x 30 cm (10-inch x 12-inch) baking sheet with butter. Place a rack in the middle of the oven and preheat it to 180 °C / 350 °F.
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pie
Take the dough from the fridge and divide it into two parts. Lightly dust the working surface and roll each piece of dough into a 30 cm x 35 cm (12-inch x 14-inch) rectangle. Place your baking sheet over the dough and cut the rolled-out dough in the same size as your baking sheet. Transfer the dough to the prepared baking pan and prick all over with a fork. Add the apple filling and arrange evenly over the dough using a spatula. Place a second piece of dough over the apple filling and prick all over with a fork. Using a cutlery knife, gently press the edges of the dough down.
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bake
Place the Apple Slab Pie into the preheated oven. Bake for 45 - 50 minutes at 180 °C / 350 °F. When the pie bakes, transfer to room temperature and leave to cool. This pie is best the next day. Before serving, dust with powdered sugar and cut into slices.