To prepare the pastry, add the ground almonds, oat flour, coconut sugar, cinnamon, flaxseed, arrowroot powder and salt to a mixing bowl. Stir well to combine.
Add the coconut oil and stir well, binding the flours.
Add the water to the mixture a little at a time until a dough forms. You can add less or more water as required to create a soft pliable dough. Wrap the dough in silicone free baking paper and refrigerate for 15 minutes.
Whilst the dough is chilling, add all the filling ingredients to a mixing bowl. Stir to combine and set aside.
Preheat the oven to 180°C/ 160°C for a fan assisted oven.
Remove the dough from the fridge and press into a 6 inch loose bottom tart tin, so that it is of an even thickness of about 1/2 a centimetre. Set aside the remaining dough.
Transfer the tart tin to the oven to bake for 10 minutes.
Remove the pastry from the oven and spoon in the fruit mixture in an even layer.
Roll the remaining pastry to a half centimetre thickness and cut into shapes of your choice and arrange across the top of the fruit. You can use cookie cutters or slice into strips to create a lattice effect.
Brush the pastry with the almond milk.
Return to the oven for 25-30 minutes or until the pastry is golden and the fruit is soft and bubbling.