• Preheat oven to 180°C (350°F). Grease a 23 cm (9 inch) pie dish.

Pastry:

• Mix all the pastry ingredients in a medium size bowl or food processor. If the mixture is too crumbly, add some extra water and mix until it becomes a pliable dough. If the mixture is too wet, add a little more flour and mix again. Set aside 1/3 of the dough.
• On a floured surface, roll out the pastry into a thin circle about 5 mm (1/4 inch) thick. Transfer the pastry to your pie dish and press it against the base and sides to form a crust.
• Trim off the excess pastry and crimp the edges if desired. Prick the bottom with a fork to let hot air escape when baking.

Filling:

• Toss all ingredients in a bowl until combined. Scoop the mixture into the pie dish and set aside.

Crumble:

• Add the oats (and nuts if using) and additional sugar to the reserved pastry. Rub with your fingers to create a crumble. Sprinkle the mixture on top of your apples.
• Bake the pie in the oven for 40-50 minutes or until the apples are tender and pastry is golden brown.
• Serve with a few dollops of cream or ice cream. Enjoy!