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Preheat oven to 180°C.
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Peal, core and slice the apples. Toss them in a large bowl with the lemon juice, brown sugar and cinnamon. Set aside for the flavours to come together and the apples to become juicy.
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Grease and flour your pie dish (I used a 26cm (10 inch) round springform pan). Roll out the pastry to the right size for your pie dish and line the dish or pan with the pastry (go all the way up the sides of the dish or pan), cut off the excess with a knife.
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Score the bottom of the pastry several times with a fork and bake for 8 minutes until it is very lightly golden.
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While the pastry is baking, place the butter for the caramel crumble into a saucepan and bring it to a simmer until it goes brown, watch it closely so it doesn’t burn. Now add the brown sugar and vanilla and simmer until the sugar dissolves. This sauce should thicken and become a bit like caramel. Stir in the oats and flour.
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Place the apples in the pastry case - you can arrange them in circles like I did, or just pile them in, it doesn’t have to be perfect! (Don't pour in the excess juices).
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Top with the caramel crumble - I like to crumble it on with my fingers to get a nice even layer.
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Bake for 10 minutes at 180°C. Turn the oven down to 160°C and bake for another 20 minutes until the apples are tender and the topping is golden brown.
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Take the pie out of the oven and leave it to cool in the pie dish or pan for about 15 minutes before serving.
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Serve with whipped cream or ice cream.