Remove the pie crust from the fridge and allow to stand on the counter for about 10 minutes. I always find this helps with rolling it out. Begin to roll the dough, being sure to rotate it every so often to avoid sticking, to a 13-inch round.
Wrap the dough around the rolling pin and unroll it over a 9-inch pie dish. Gently fit the dough into the bottom and up the sides of the pie dish. Trim the dough around the pie dish, leaving a 1 1/2-inch overhang (this is important if you want a nice crimp).
Tuck the overhang under itself all the way around. Rest your right thumb on the edge of the pie crust and using your left hand, shape a V. Push the two together, creating a large crimp. Work your way around the entire pie crust until you’re done. Stick the pie crust in the freezer while you make the filling.
Bring a medium pot filled with water to a boil. Drop the cubes of sweet potato in the water and boil for about 25 to 30 minutes, until very very tender. Drain and set aside. Using a ricer, add the sweet potato and press down until you’ve worked your way through all of the sweet potato.
You should end up with about 2 cups of sweet potato puree. You could also use canned sweet potato puree. If using canned, be sure to measure out 2 cups of sweet potato puree and proceed with the recipe
Preheat the oven to 350 degrees F. To a blender, add the eggs, sugar, brown sugar, ground cinnamon, ginger, nutmeg, salt and coconut milk. Pulse until very smooth.
Next, add the smashed sweet potato and pulse again until pureed and very smooth, about 1 minute. Remove the pie crust from the fridge and brush the edges with egg wash.
Pour in the filling and transfer to the oven to bake for 45 to 50 minutes, until set but still wobbly in the center. Remove it from the oven and allow to come to room temperature on the kitchen counter to set for 3 to 4 hours before slicing.