Pre heat the oven to 200C / 180C fan and lightly grease a 21cm / 8.5 inch tart tin.
Combine the flour, sugar, cubed vegan butter, water and salt in a food processor. Blitz until the mixture loosely comes together. Turn out onto a lightly floured work surface, knead for 30 seconds and then form into a ball.
Roll out the pastry into a disc just larger than your tart tin. Gently layer the pastry over your tin and press down firmly and evenly. Trim the excess pastry and use a fork to poke holes in the pastry base. Fill the pastry with baking paper and baking beans and bake for 20 minutes.
Remove the baking beans and blind bake for an additional 5 minutes. Remove the pie from the oven and allow to cool for 20 minutes in the tin.
Meanwhile make a start on the custard filling. Pour the coconut milk and cinnamon stick into a large saucepan and bring to the boil.
Use an electric or balloon whisk to whisk the remaining ingredients in a mixIng bowl, then add the mixture to the coconut milk. Continue whisking over a low - medium heat until you reach a pudding like, thick custard consistency. Stir in a tiny pinch of turmeric to add colour to your custard filling.
Remove the cinnamon stick and pour the custard into the pastry case. Place in the fridge to set for a minimum of 2 hours. Finish with a generous sprinkling of cinnamon and toasted flaked almonds.