For preparing easy apple pie, place the flour and butter into a bowl and rub the butter into the flour.
Mix in the rest of the ingredients: icing sugar, egg yolk and cold milk. Knead briefly on a lightly floured work surface, then leave to rest for 30 minutes.
Roll out and line a pie dish and bake blind at 400 F(200 C) for 18 to 20 mins to get the pie shell.
Cook the chopped apple with lemon juice, ground cinnamon, sugar and water till apples are translucent.
Crumble the cake and add this to the apple mix.
Spread a thin layer of jam in the baked pie-case and fill with apple-cake mix and press it down.
Dot it with the butter.
Roll out the remaining pastry and cut into strips and decorate the top of the pie.
Brush it with a mix of egg white, sugar and milk.
Bake till the top is golden brown in colour.