First, make the walnut meal by adding the nuts to a mini chopper or blender and blitzing until you get a fine meal.
Make the flax egg by mixing the ground flax and water in a bowl–set aside to thicken.
Grease a round, loose bottom pie pan with oil. I used 25cm pan.
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 10 minutes on Gas Mark 4 for 10 minutes. Remove from the oven.
Layer the filling mix across the bottom of the tart, then add in the tomatoes. Press in a little.
Drizzle with a little olive oil and sprinkle of sea salt.
Return to the oven and bake for 25-30 minutes (until the base is crispy and the tomatoes are cooked and caramelising). Allow to cool before removing the pan.
Allow to cool and then sprinkle on fresh basil & oregano.