In large skillet over medium-low heat, combine filling ingredients. Sauté about 5 minutes, stirring occasionally. DO NOT OVER COOK OR YOU’LL MAKE APPLESAUCE. Remove from heat. Set aside.
After the dough in the pie pan has chilled an hour, lay a sheet of aluminum foil over the dough and gently press it down to confirm to the shape of the pan. Fold over the edges to prevent the edges burning and pour in pie weights or sugar. Weights or sugar should come up ¾ of the side of the pie to prevent the crust from puffing up and losing its shape while cooking. Place on a baking sheet (for easy transport) and partially bake crust at 425 degrees F for 10 minutes. Remove from oven and set aside.
Spoon ½ apple mixture in pie crust-lined pie pan. Pour ½ custard mixture over apples. Add remaining apples and pour in remaining custard.
Gently place the woven crust on the top of the filling. Trim and seal the edges, using a paring knife to trim excess dough and then pressing the lattice gently to the bottom crust to seal.
For the Egg Wash: Whisk egg, water and cream, if using, together in a small bowl, then brush over the pie.
Stick on any decorative pieces and then sprinkle sanding sugar heavily over the entire pie top.
Bake at 425 for 35 – 40 minutes or until crust is golden brown and flaky, with no doughy damp areas remaining. Check frequently and cover as necessary with pie shield and pieces of aluminum foil.
Meanwhile, make the Crème Anglaise: In a medium saucepan, bring cream just to a boil. In a small bowl, combine 4 egg yolks and 2/3 cup sugar. Blend a small amount of cream into yolks. Blend yolk mixture into cream and cook over low heat about 10 minutes or until mixture coats a spoon. Do not boil. Remove from heat. Sift in cinnamon and nutmeg. Crème Anglaise may be made up to 2 days ahead and chilled, covered.
To serve, pour small amount of warm Crème Anglaise onto individual plates. Cut warm pie into 8 – 10 pieces and place on the plates.