Combine the cranberries, salt, sugar, flour and refrigerate the mixture one or more hours. Add the butter when you add the cranberry mixture into the pie crust. Make a lattice pie crust for the top of the pie. Brush the pie crust lattice top with an egg for glaze.

Preheat oven to 450 degrees. Bake the pie 10 minutes. Then lower the oven to 350 degrees and bake another 45 minutes. Serve pie in wedges with vanilla ice cream or whipped cream.