Once short crust pastry and cream have cooled, assemble the cake.
Preheat your oven to 160 °C (320 °F) static mode, and grease your baking dish with butter.
Use three-quarters of pastry dough to create the base. Place in center of cake pan and spread with fingertips, pressing from center to edges. Press center with hands until about 5 mm thick.
Use fingertips to ensure dough adheres well to edges, then trim excess with a knife. Prick base with fork tines and fill with now cold custard.
Knead leftover short crust pastry again and roll out dough to a thickness of 2-3 mm on a sheet of baking paper.
Roll pastry disk onto rolling pin and unroll onto mold to cover cream. Press edges with fingers to seal and roll over with rolling pin to eliminate excess.
Brush surface with a little egg white and prick with fork tines, then sprinkle with pine nuts.
Bake the cake in a preheated conventional oven at 160 °C (320 °F) for 50 minutes on the bottom shelf, then raise temperature to 180 °C (356 °F) and bake for another 10 minutes. If the surface darkens too much during baking, cover with aluminum foil.
Once baked, remove from the oven and let the cake cool completely before removing it from the baking dish. Transfer the cooled cake to the refrigerator for at least 3 hours.
Just before serving, dust the top generously with powdered sugar. Serve your delicious custard pie!