Preheat the oven to Gas Mark 4/180c
Grease a round, loose bottom pie pan with a little oil. I used an 8 inch pan.
First, make the almond meal by adding the nuts to a mini chopper or blender and blitzing until you get a fine meal. Or use pre ground almonds.
Make the flax egg by mixing the ground flax and water in a bowl–set aside to thicken.
Add all the dry ingredients to a large bowl and mix to combine. Then add in the oil, almond milk and flax egg. Mix throughly to form a dough.
Transfer the dough to the tart pan and use your fingers to press into the bottom and up the sides. Poke a few holes with a fork across the bottom.
Bake food for 20 minutes on Gas Mark 4/180c. Remove from the oven. Allow the tart base to cool.