Preheat oven to 350˚F
In a mixing bowl, stir together flour and salt. Cut vegan butter into 1/2 inch pieces and coat them in the flour. Flatten butter pieces between your thumb and fingers. Add olive oil and then rub the butter pieces and olive oil into flour with your hands until mixture resembles coarse breadcrumbs with some larger pieces.
Add ice water about 1 tablespoon at a time, stirring with a fork or your fingertips, until dough holds together when squeezed in your palm. Note: The total amount of water needed will vary on the humidity and air temperature at the time.
Turn dough out onto a work surface and gently work it into a disc then cover it in wrap. Refrigerate and let the dough rest for 20 minutes before rolling it out to relax the gluten.
Roll out dough to 1/4" thick on a well-floured surface.
Roll up crust onto the rolling pin and transfer it to a pie plate. Gently guide the dough into the pie plate with your hands so that there is no space between the pie plate and the dough. Trim overhanging dough to 1". Tuck the outer edge under itself and crimp crust all the way around. If making a leaf cutout crust as shown in photos, trim off all of the overhanging dough and proceed with blind-baking in the following step. Gather the scraps of dough into a ball and set aside to use while crust is blind-baking.
Place a piece of parchment over the pie shell and fill with pie weights or dried beans to hold crust in place and to keep it from puffing. Bake pie shell for 20 minutes then remove from oven, remove parchment and pie weights/beans then set aside on a cooling rack. Pie shell will only be partially baked.
While pie shell is baking, optionally re-roll gathered dough scraps to 1/4" thickness and cut out leaf shapes for a decorative pie border. Use a sharp knife or bread lame to score "veins" in the leaf cutouts. Leave them on work surface until final assembly.
Next prepare the filling by adding all filling ingredients to a blender. Blend on high until smooth and creamy, about 1 minute.
When the crust is done blind-baking, adjust oven temperature to 375˚F.
Pour filling into pre-baked pie shell. Smooth out top with a spatula and tap pie plate a couple of times on a board or counter top to release air bubbles. Brush the crust with non-dairy milk.
If creating a decorative leaf crust, brush bottoms of cutouts with non-dairy milk and arrange them one by one around the border of the pie. Then brush the tops with more non-dairy milk.
Arrange extra cutouts on a parchment lined baking sheet and brush them with non-dairy milk, then pop them in the oven for the last 10 minutes of bake time in the following step.
Bake at 375˚F for 35-45 minutes until the crust is golden brown and the filling puffs up but is still jiggly. Remove from oven and allow to cool to room temperature on cooling rack. The filling will continue to set up as it cools. Decorate the top with extra leaf cut-outs. Cool the pie completely and refrigerate it overnight for the best texture and glassy top.