Set your oven to preheat at 400°F (205°C).
Gently roll out the first piece of the pie crust and shape it into an 8-9 inch pie dish.
Mix the raspberries with the lemon juice in a spacious bowl.
In a separate container, blend the sugar, cornstarch, and salt.
Gradually add the sugar blend into the raspberry mix, ensuring an even spread.
Transfer the raspberry blend into the pie dish. Proceed to roll out the second pie crust, placing it atop the filling. Secure the edges and carve out a design or simple vents on the crust.
Stir the egg and water to create a wash, and gently brush it over the pie's surface.
Bake for about 40-50 minutes or until you witness a golden-brown crust and bubbling fill.
Allow it to cool down entirely before diving in. For an extra-firm filling, consider refrigerating for a few hours.