2: Start the mixer and knead until smooth. Stop the mixer and leave the mixture in.
3: Peel 1 kg apple, remove the core and slice into strips (a mandolin is ideal for this).
4: Pour the apples into the mixer and run for a minute or two until well blended.
5: Preheat oven to 200°C (390°F). Line a baking dish with buttered baking paper.
6: Pour the mixture in, smooth the top a little...
7: ... and bake for about 45 minutes.
8: Let cool, or at least lukewarm...
9: ... before unmolding. Enjoy warm or cold, on its own or with a little custard or a scoop of vanilla ice cream, or both!
Remarks
You really need to line the bottom of the dish with baking paper, as the pastry sticks a lot after baking. To balance out the very sweet side of the pastry, use slightly tart apples such as Reinette if possible.