Preheat your oven to 375F. Take your already made and chilled pie crust out of the refrigerator to warm slightly.
Wash, dry, and hull your strawberries. Cut into halves or thirds and place in a medium bowl. Add the sugar and lemon juice. Stir thoroughly.
Take a quick taste to make sure the sugar sweetness is where you want it, remembering that as the berries break down in the oven, they will get sweeter.
Add the cornstarch and mix well.
Roll your pie dough out on a well floured surface with a floured rolling pin. Roll to about 1/4 inch thick and large enough to fill a 9 inch standard pie plate.
Once rolled, transfer the pie crust onto the center of the pie plate and trim the excess dough from the edges. Leaving about 3/4-1 inch left.
Pour the strawberry mixture into the pie shell.
Quickly roll out the second piece of dough to the same dimensions and place on-top of the pie, trimming the edges slightly so there is about 1 inch left. Pinch/crimp the dough around the pie with either your fingers or with the tines of a fork. Cut slits or decorative vents onto the top of the pie. The shape isn't that important, but it is necessary to have some sort of opening on the top so the trapped steam can escape while baking.
Place your egg yolk into a small bowl and mix with a splash of water until combined. Brush onto the pie crust. Sprinkle with Turbinado sugar.
Place the pie into the oven, with or without a baking sheet underneath it to catch spills, and bake for 50-55 minutes, or until bubbly and golden brown.
Keep an eye for over-browning. You can use strips of foil over the more cooked-looking crust to protect it from burning once the pastry has reached an appropriate level of browning.
Allow to cool completely before serving. I like to wait overnight, keeping the pie on the counter with a tea-towel or kitchen towel on top of it - the extra time allows the pie filling to properly set.