Whisk flour and salt together in a large bowl.
Cut in the cold, cubed butter until the mixture resembles coarse crumbs.
Gradually add ice-cold water, stirring until the dough just comes together.
Form into two disks, wrap in plastic, and chill for at least 1 hour.
In a bowl, toss sliced apples with sugar, cinnamon, lemon juice, and cornstarch.
Cook apple mixture on the stovetop over medium heat for 5-7 minutes to reduce excess juices.
Roll out the chilled dough on a floured surface to fit your pie dish.
Fill the crust with the apple mixture and cover with the second rolled dough piece.
Crimp the edges to seal and cut small slits in the top for venting.
Bake at 375°F (190°C) for 60 minutes or until the crust is golden brown and the filling is bubbling.